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新高考數(shù)學(xué)考前沖刺練習(xí)卷數(shù)學(xué)注意事項(xiàng):1.答卷前,考生務(wù)必將自己的姓名、準(zhǔn)考證號(hào)等填寫在答題卡和試卷指定位置上。2.回答選擇題時(shí),選出每小題答案后,用鉛筆把答題卡上對(duì)應(yīng)題目的答案標(biāo)號(hào)涂黑。如需改動(dòng),用橡皮擦干凈后,再選涂其他答案標(biāo)號(hào)?;卮鸱沁x擇題時(shí),將答案寫在答題卡上。寫在本試卷上無效。3.考試結(jié)束后,將本試卷和答題卡一并交回。第Ⅰ卷一、單項(xiàng)選擇題:本題共8小題,每小題5分,共40分.在每小題給出的四個(gè)選項(xiàng)中,只有一項(xiàng)是符合題目要求.1.已知集合SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0等于(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<02.設(shè)復(fù)數(shù)z滿足SKIPIF1<0,則SKIPIF1<0(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<03.八卦是中國(guó)文化的基本學(xué)概念,圖1是八卦模型圖,其平面圖形為圖2所示的正八邊形SKIPIF1<0,其中SKIPIF1<0給出下列結(jié)論,其中正確的結(jié)論為(
)A.SKIPIF1<0與SKIPIF1<0的夾角為SKIPIF1<0B.SKIPIF1<0C.SKIPIF1<0D.SKIPIF1<0在SKIPIF1<0上的投影向量為SKIPIF1<0(其中SKIPIF1<0為與SKIPIF1<0同向的單位向量)4.現(xiàn)有甲?乙?丙三個(gè)工廠加工的同種產(chǎn)品各100件,按標(biāo)準(zhǔn)分為一?二兩個(gè)等級(jí)?其中甲?乙?丙三個(gè)工廠的一等品各有60件?70件?80件.從這300件產(chǎn)品中任選一件產(chǎn)品,則下列說法錯(cuò)誤的是(
)A.選中的產(chǎn)品是甲廠的一等品與選中的產(chǎn)品是乙廠的二等品互斥B.選中的產(chǎn)品是一等品的概率為SKIPIF1<0C.選中的產(chǎn)品是丙廠生產(chǎn)的二等品的概率為SKIPIF1<0D.選中的產(chǎn)品是丙廠生產(chǎn)的產(chǎn)品與選中的產(chǎn)品是二等品相互獨(dú)立5.函數(shù)SKIPIF1<0(其中SKIPIF1<0,SKIPIF1<0)的圖象如圖所示,為了得到SKIPIF1<0的圖象,則需將SKIPIF1<0的圖象(
)A.橫坐標(biāo)縮短到原來的SKIPIF1<0,再向右平移SKIPIF1<0個(gè)單位B.橫坐標(biāo)縮短到原來的SKIPIF1<0,再向右平移SKIPIF1<0個(gè)單位C.橫坐標(biāo)伸長(zhǎng)到原來的2倍,再向右平移SKIPIF1<0個(gè)單位D.橫坐標(biāo)伸長(zhǎng)到原來的2倍,再向右平移SKIPIF1<0個(gè)單位6.已知等比數(shù)列SKIPIF1<0的公比的平方不為SKIPIF1<0,則“SKIPIF1<0是等比數(shù)列”是“SKIPIF1<0是等差數(shù)列”的(
)A.充分不必要條件 B.必要不充分條件C.充要條件 D.既不充分也不必要條件7.設(shè)SKIPIF1<0,SKIPIF1<0,SKIPIF1<0則(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<08.2023年是農(nóng)歷癸卯兔年,在中國(guó)傳統(tǒng)文化中,兔被視為一種祥瑞之物,是活力和幸福的象征,寓意福壽安康.故宮博物院就收藏著這樣一副蘊(yùn)含“吉祥團(tuán)圓”美好愿景的名畫——《梧桐雙兔圖》,該絹本設(shè)色畫縱約176cm,橫約95cm,其掛在墻壁上的最低點(diǎn)SKIPIF1<0離地面194cm.小南身高160cm(頭頂距眼睛的距離為10cm),為使觀賞視角SKIPIF1<0最大,小南離墻距離SKIPIF1<0應(yīng)為(
)SKIPIF1<0 B.SKIPIF1<0 C.94cm D.76cm二、多項(xiàng)選擇題:本題共4小題,每小題5分,共20分.在每小題給出的選項(xiàng)中,有多項(xiàng)符合題目要求.全部選對(duì)的得5分,部分選對(duì)的得2分,有選錯(cuò)的得0分.9.已知向量,SKIPIF1<0,SKIPIF1<0,則下列命題正確的是(
)A.當(dāng)且僅當(dāng)SKIPIF1<0時(shí),SKIPIF1<0 B.SKIPIF1<0在SKIPIF1<0上的投影向量為SKIPIF1<0C.存在θ,使得SKIPIF1<0 D.存在θ,使得SKIPIF1<010.給出下列命題,其中正確的是(
)A.對(duì)于獨(dú)立性檢驗(yàn)SKIPIF1<0的值越大,說明兩事件相關(guān)程度越大.B.若隨機(jī)變量SKIPIF1<0,則SKIPIF1<0C.若SKIPIF1<0,則D.已知樣本點(diǎn)SKIPIF1<0組成一個(gè)樣本,得到回歸直線方程SKIPIF1<0,且SKIPIF1<0,剔除兩個(gè)樣本點(diǎn)SKIPIF1<0和SKIPIF1<0得到新的回歸直線的斜率為SKIPIF1<0,則新的回歸方程為SKIPIF1<011.圓M:SKIPIF1<0關(guān)于直線SKIPIF1<0對(duì)稱,記點(diǎn)SKIPIF1<0,下列結(jié)論正確的是(
)A.點(diǎn)P的軌跡方程為SKIPIF1<0 B.以PM為直徑的圓過定點(diǎn)SKIPIF1<0C.SKIPIF1<0的最小值為6 D.若直線PA與圓M切于點(diǎn)A,則12.在棱長(zhǎng)為2的正方體SKIPIF1<0中,點(diǎn)E,F(xiàn)分別為棱BC與SKIPIF1<0的中點(diǎn),則下列選項(xiàng)正確的有(
)A.SKIPIF1<0平面SKIPIF1<0B.SKIPIF1<0與SKIPIF1<0所成的角為30°C.平面SKIPIF1<0D.平面SKIPIF1<0截正方體SKIPIF1<0的截面面積為SKIPIF1<0第Ⅱ卷三、填空題:本題共4小題,每小題5分,共20分13.為了做好疫情防控期間的校園消毒工作,某學(xué)校對(duì)教室進(jìn)行消毒,室內(nèi)每立方米空氣中的含藥量y(單位:毫克)隨時(shí)間x(單位:小時(shí))的變化情況如圖所示,在藥物釋放的過程中,y與x成正比;藥物釋放完畢后,y與x的函數(shù)關(guān)系式為SKIPIF1<0(a為常數(shù)),根據(jù)測(cè)定,當(dāng)空氣中每立方米的含藥量降低到SKIPIF1<0毫克以下時(shí),學(xué)生方可進(jìn)教室學(xué)習(xí),那么從藥物釋放開始,至少需要經(jīng)過___________小時(shí)后,學(xué)生才能回到教室.14.已知函數(shù)SKIPIF1<0的定義域?yàn)镾KIPIF1<0,其導(dǎo)函數(shù)為SKIPIF1<0,若SKIPIF1<0.SKIPIF1<0,則關(guān)于x的不等式SKIPIF1<0的解集為__________.已知橢圓SKIPIF1<0,SKIPIF1<0、SKIPIF1<0為SKIPIF1<0的左、右焦點(diǎn),SKIPIF1<0是橢圓上的動(dòng)點(diǎn),則SKIPIF1<0內(nèi)切圓半徑的最大值為________.16.已知SKIPIF1<0是定義在SKIPIF1<0上的奇函數(shù),且SKIPIF1<0在SKIPIF1<0上單調(diào)遞減,SKIPIF1<0為偶函數(shù),若SKIPIF1<0在SKIPIF1<0上恰好有4個(gè)不同的實(shí)數(shù)根SKIPIF1<0,則SKIPIF1<0_______.四、解答題:本小題共6小題,共70分,其中第17題10分,18~22題12分。解答應(yīng)寫出文字說明、證明過程或演算步驟.17.在銳角SKIPIF1<0中,SKIPIF1<0分別為內(nèi)角SKIPIF1<0的對(duì)邊,SKIPIF1<0,角SKIPIF1<0的平分線交SKIPIF1<0于SKIPIF1<0,SKIPIF1<0.(1)求SKIPIF1<0;(2)求SKIPIF1<0外接圓面積的最小值.18.已知函數(shù)SKIPIF1<0,等比數(shù)列SKIPIF1<0的前n項(xiàng)和為SKIPIF1<0,數(shù)列SKIPIF1<0SKIPIF1<0的首項(xiàng)為c,且前n項(xiàng)和SKIPIF1<0滿足SKIPIF1<0SKIPIF1<0.(1)求數(shù)列SKIPIF1<0和SKIPIF1<0的通項(xiàng)公式;(2)若數(shù)列SKIPIF1<0前n項(xiàng)和為SKIPIF1<0,求使SKIPIF1<0的最小正整數(shù)n.19.如圖1,在SKIPIF1<0中,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0為SKIPIF1<0的中點(diǎn),SKIPIF1<0為SKIPIF1<0上一點(diǎn),且SKIPIF1<0.現(xiàn)將SKIPIF1<0沿SKIPIF1<0翻折到SKIPIF1<0,如圖2.(1)證明:SKIPIF1<0.(2)已知二面角SKIPIF1<0為SKIPIF1<0,在棱SKIPIF1<0上是否存在點(diǎn)SKIPIF1<0,使得直線SKIPIF1<0與平面SKIPIF1<0所成角的正弦值為SKIPIF1<0?若存在,確定SKIPIF1<0的位置;若不存在,請(qǐng)說明理由.20.2022年冬季奧林匹克運(yùn)動(dòng)會(huì)主辦城市是北京,北京成為第一個(gè)舉辦過夏季奧林匹克運(yùn)動(dòng)會(huì)和冬季奧林匹克運(yùn)動(dòng)會(huì)以及亞洲運(yùn)動(dòng)會(huì)三項(xiàng)國(guó)際賽事的城市!為迎接冬奧會(huì)的到來,某地很多中小學(xué)開展了模擬冬奧會(huì)賽事的活動(dòng),為了深入了解學(xué)生在“自由式滑雪”和“單板滑雪”兩項(xiàng)活動(dòng)的參與情況,在該地隨機(jī)選取了10所學(xué)校進(jìn)行研究,得到如下數(shù)據(jù):(1)在這10所學(xué)校中隨機(jī)選取3所來調(diào)查研究,求這3所學(xué)校參與“自由式滑雪”都超過40人的概率;(2)“單板滑雪”參與人數(shù)超過45人的學(xué)校可以作為“基地學(xué)?!保F(xiàn)在從這10所學(xué)校中隨機(jī)選出3所,記SKIPIF1<0為選出可作“基地學(xué)校”的學(xué)校個(gè)數(shù),求X的分布列和數(shù)學(xué)期望;(3)現(xiàn)在有一個(gè)“單板滑雪”集訓(xùn)營(yíng),對(duì)“滑行、轉(zhuǎn)彎、停止”這3個(gè)動(dòng)作技巧進(jìn)行集訓(xùn),且在集訓(xùn)中進(jìn)行了多輪測(cè)試.規(guī)定:在一輪測(cè)試中,這3個(gè)動(dòng)作中至少有2個(gè)動(dòng)作達(dá)到“優(yōu)秀”,則該輪測(cè)試記為“優(yōu)秀”.在集訓(xùn)測(cè)試中,小明同學(xué)3個(gè)動(dòng)作中每個(gè)動(dòng)作達(dá)到“優(yōu)秀”的概率均為SKIPIF1<0,每個(gè)動(dòng)作互不影響且每輪測(cè)試互不影響.如果小明同學(xué)在集訓(xùn)測(cè)試中要想獲得“優(yōu)秀”的次數(shù)的平均值達(dá)到5次,那么理論上至少要進(jìn)行多少輪測(cè)試?21.已知雙曲線SKIPIF1<0的漸近線與曲線SKIPIF1<0相切.橫坐標(biāo)為SKIPIF1<0的點(diǎn)SKIPIF1<0在曲線SKIPIF1<0上,過點(diǎn)SKIPIF1<0作曲線SKIPIF1<0的切線SKIPIF1<0交雙曲線SKIPIF1<0于不同的兩點(diǎn)SKIPIF1<0.(1)求雙曲線SKIPIF1<0的離心率;(2)記SKIPIF1<0的中垂線交SKIPIF1<0軸于點(diǎn)SKIPIF1<0.是否存在實(shí)數(shù)SKIPIF1<0,使得SKIPIF1<0?若存在,請(qǐng)求出SKIPIF1<0的值;若不存在,請(qǐng)說明理由.22.已知函數(shù)SKIPIF1<0,SKIPIF1<0,其中SKIPIF1<0且SKIPIF1<0.(1)證明:當(dāng)SKIPIF1<0時(shí),SKIPIF1<0恒成立;(2)證明:當(dāng)SKIPIF1<0時(shí),曲線SKIPIF1<0與曲線SKIPIF1<0有且只有兩條公切線.新高考數(shù)學(xué)考前沖刺練習(xí)卷數(shù)學(xué)·全解全析注意事項(xiàng):1.答卷前,考生務(wù)必將自己的姓名、準(zhǔn)考證號(hào)等填寫在答題卡和試卷指定位置上。2.回答選擇題時(shí),選出每小題答案后,用鉛筆把答題卡上對(duì)應(yīng)題目的答案標(biāo)號(hào)涂黑。如需改動(dòng),用橡皮擦干凈后,再選涂其他答案標(biāo)號(hào)。回答非選擇題時(shí),將答案寫在答題卡上。寫在本試卷上無效。3.考試結(jié)束后,將本試卷和答題卡一并交回。第Ⅰ卷一、單項(xiàng)選擇題:本題共8小題,每小題5分,共40分.在每小題給出的四個(gè)選項(xiàng)中,只有一項(xiàng)是符合題目要求.1.已知集合SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0等于(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【答案】A【分析】根據(jù)對(duì)數(shù)函數(shù)的單調(diào)性解出集合A,根據(jù)指數(shù)函數(shù)的性質(zhì)解得集合B,結(jié)合交集的概念和運(yùn)算即可求解.【詳解】由SKIPIF1<0,得SKIPIF1<0,解得SKIPIF1<0,即SKIPIF1<0,由SKIPIF1<0,得SKIPIF1<0,即SKIPIF1<0,所以SKIPIF1<0.故選:A.2.設(shè)復(fù)數(shù)z滿足SKIPIF1<0,則SKIPIF1<0(
)A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】D【分析】先化簡(jiǎn)出SKIPIF1<0,再計(jì)算SKIPIF1<0,最后代模長(zhǎng)公式即可求解【詳解】由題知SKIPIF1<0,于是SKIPIF1<0,所以SKIPIF1<0.故選:D3.八卦是中國(guó)文化的基本學(xué)概念,圖1是八卦模型圖,其平面圖形為圖2所示的正八邊形SKIPIF1<0,其中SKIPIF1<0給出下列結(jié)論,其中正確的結(jié)論為(
)A.SKIPIF1<0與SKIPIF1<0的夾角為SKIPIF1<0B.SKIPIF1<0C.SKIPIF1<0D.SKIPIF1<0在SKIPIF1<0上的投影向量為SKIPIF1<0(其中SKIPIF1<0為與SKIPIF1<0同向的單位向量)【答案】C【分析】結(jié)合正八邊形的性質(zhì)以及向量的知識(shí)對(duì)選項(xiàng)進(jìn)行分析,從而確定正確選項(xiàng).【詳解】SKIPIF1<0,所以SKIPIF1<0的夾角為SKIPIF1<0,A選項(xiàng)錯(cuò)誤.由于四邊形SKIPIF1<0不是平行四邊形,所以SKIPIF1<0,SKIPIF1<0是等腰直角三角形,所以SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0,C選項(xiàng)正確.結(jié)合圖像可知SKIPIF1<0在SKIPIF1<0上的投影向量與SKIPIF1<0的方向相反,所以D選項(xiàng)錯(cuò)誤.故選:C【點(diǎn)睛】4.現(xiàn)有甲?乙?丙三個(gè)工廠加工的同種產(chǎn)品各100件,按標(biāo)準(zhǔn)分為一?二兩個(gè)等級(jí)?其中甲?乙?丙三個(gè)工廠的一等品各有60件?70件?80件.從這300件產(chǎn)品中任選一件產(chǎn)品,則下列說法錯(cuò)誤的是(
)A.選中的產(chǎn)品是甲廠的一等品與選中的產(chǎn)品是乙廠的二等品互斥B.選中的產(chǎn)品是一等品的概率為SKIPIF1<0C.選中的產(chǎn)品是丙廠生產(chǎn)的二等品的概率為SKIPIF1<0D.選中的產(chǎn)品是丙廠生產(chǎn)的產(chǎn)品與選中的產(chǎn)品是二等品相互獨(dú)立【答案】D【分析】運(yùn)用互斥事件、獨(dú)立事件的定義可判斷A項(xiàng)、D項(xiàng),運(yùn)用古典概型求概率可判斷B項(xiàng)、C項(xiàng).【詳解】對(duì)于A項(xiàng),“選中的產(chǎn)品是甲廠的一等品”記為事件A,“選中的產(chǎn)品是乙廠的二等品”記為事件B,則SKIPIF1<0,所以選中的產(chǎn)品是甲廠的一等品與選中的產(chǎn)品是乙廠的二等品互斥,故A項(xiàng)正確;對(duì)于B項(xiàng),選中的產(chǎn)品是一等品的概率為SKIPIF1<0,故B項(xiàng)正確;對(duì)于C項(xiàng),選中的產(chǎn)品是丙廠生產(chǎn)的二等品的概率為SKIPIF1<0,故C項(xiàng)正確;對(duì)于D項(xiàng),“選中的產(chǎn)品是丙廠生產(chǎn)的產(chǎn)品”記為事件C,“選中的產(chǎn)品是二等品”記為事件D,則SKIPIF1<0,由B項(xiàng)知,SKIPIF1<0,由C項(xiàng)知,SKIPIF1<0,所以SKIPIF1<0,所以選中的產(chǎn)品是丙廠生產(chǎn)的產(chǎn)品與選中的產(chǎn)品是二等品不互相獨(dú)立,故D項(xiàng)不成立.故選:D.5.函數(shù)SKIPIF1<0(其中SKIPIF1<0,SKIPIF1<0)的圖象如圖所示,為了得到SKIPIF1<0的圖象,則需將SKIPIF1<0的圖象(
)A.橫坐標(biāo)縮短到原來的SKIPIF1<0,再向右平移SKIPIF1<0個(gè)單位B.橫坐標(biāo)縮短到原來的SKIPIF1<0,再向右平移SKIPIF1<0個(gè)單位C.橫坐標(biāo)伸長(zhǎng)到原來的2倍,再向右平移SKIPIF1<0個(gè)單位D.橫坐標(biāo)伸長(zhǎng)到原來的2倍,再向右平移SKIPIF1<0個(gè)單位【答案】D【分析】先根據(jù)圖象的特點(diǎn)可求出SKIPIF1<0,然后再根據(jù)周期變換與相位變換即可得出.【詳解】由圖象可知:SKIPIF1<0,則SKIPIF1<0,由SKIPIF1<0,解得SKIPIF1<0,則SKIPIF1<0,∵SKIPIF1<0的圖象過點(diǎn)SKIPIF1<0,則SKIPIF1<0,可得SKIPIF1<0,解得SKIPIF1<0,又∵SKIPIF1<0,則SKIPIF1<0,故SKIPIF1<0.故將函數(shù)SKIPIF1<0圖象的橫坐標(biāo)伸長(zhǎng)到原來的2倍得到SKIPIF1<0的圖象,然后再向右平移SKIPIF1<0個(gè)單位即可得到SKIPIF1<0的圖象.故選:D.6.已知等比數(shù)列SKIPIF1<0的公比的平方不為SKIPIF1<0,則“SKIPIF1<0是等比數(shù)列”是“SKIPIF1<0是等差數(shù)列”的(
)A.充分不必要條件 B.必要不充分條件C.充要條件 D.既不充分也不必要條件【答案】C【分析】利用等差數(shù)列和等比數(shù)列的遞推關(guān)系進(jìn)行證明即可.【詳解】設(shè)等比數(shù)列SKIPIF1<0的公比為SKIPIF1<0,若SKIPIF1<0是等比數(shù)列,則SKIPIF1<0為常數(shù),由SKIPIF1<0為常數(shù),所以SKIPIF1<0是等差數(shù)列;若SKIPIF1<0是等差數(shù)列,設(shè)SKIPIF1<0的公差為SKIPIF1<0,則SKIPIF1<0為常數(shù),所以SKIPIF1<0是等比數(shù)列.綜上,“SKIPIF1<0是等比數(shù)列”是“SKIPIF1<0是等差數(shù)列”的充要條件.故選:C7.設(shè)SKIPIF1<0,SKIPIF1<0,SKIPIF1<0則(
)A.SKIPIF1<0 B.SKIPIF1<0C.SKIPIF1<0 D.SKIPIF1<0【答案】C【分析】構(gòu)造函數(shù)SKIPIF1<0,利用導(dǎo)數(shù)研究SKIPIF1<0的單調(diào)性,由此確定正確答案.【詳解】設(shè)SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0在區(qū)間SKIPIF1<0遞減;在區(qū)間SKIPIF1<0遞增.SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,由于SKIPIF1<0,所以SKIPIF1<0,即SKIPIF1<0.故選:C8.2023年是農(nóng)歷癸卯兔年,在中國(guó)傳統(tǒng)文化中,兔被視為一種祥瑞之物,是活力和幸福的象征,寓意福壽安康.故宮博物院就收藏著這樣一副蘊(yùn)含“吉祥團(tuán)圓”美好愿景的名畫——《梧桐雙兔圖》,該絹本設(shè)色畫縱約176cm,橫約95cm,其掛在墻壁上的最低點(diǎn)SKIPIF1<0離地面194cm.小南身高160cm(頭頂距眼睛的距離為10cm),為使觀賞視角SKIPIF1<0最大,小南離墻距離SKIPIF1<0應(yīng)為(
)SKIPIF1<0 B.SKIPIF1<0 C.94cm D.76cm【答案】B【分析】由題意只需SKIPIF1<0最大,設(shè)小南眼睛所在的位置點(diǎn)為點(diǎn)SKIPIF1<0,過點(diǎn)SKIPIF1<0做直線SKIPIF1<0的垂線,垂足為SKIPIF1<0,求出SKIPIF1<0,SKIPIF1<0,設(shè)SKIPIF1<0,則SKIPIF1<0,求出SKIPIF1<0,SKIPIF1<0,代入SKIPIF1<0,利用基本不等式求解即可.【詳解】由題意可得SKIPIF1<0為銳角,故要使SKIPIF1<0最大,只需SKIPIF1<0最大,設(shè)小南眼睛所在的位置點(diǎn)為點(diǎn)SKIPIF1<0,過點(diǎn)SKIPIF1<0做直線SKIPIF1<0的垂線,垂足為SKIPIF1<0,如圖,則依題意可得SKIPIF1<0(cm),SKIPIF1<0(cm),SKIPIF1<0,設(shè)SKIPIF1<0,則SKIPIF1<0,且SKIPIF1<0,SKIPIF1<0,故SKIPIF1<0SKIPIF1<0,當(dāng)且僅當(dāng)SKIPIF1<0即SKIPIF1<0時(shí)等號(hào)成立,故使觀賞視角SKIPIF1<0最大,小南離墻距離SKIPIF1<0應(yīng)為SKIPIF1<0cm.故選:B.二、多項(xiàng)選擇題:本題共4小題,每小題5分,共20分.在每小題給出的選項(xiàng)中,有多項(xiàng)符合題目要求.全部選對(duì)的得5分,部分選對(duì)的得2分,有選錯(cuò)的得0分.9.已知向量,SKIPIF1<0,SKIPIF1<0,則下列命題正確的是(
)A.當(dāng)且僅當(dāng)SKIPIF1<0時(shí),SKIPIF1<0 B.SKIPIF1<0在SKIPIF1<0上的投影向量為SKIPIF1<0C.存在θ,使得SKIPIF1<0 D.存在θ,使得SKIPIF1<0【答案】ABD【分析】根據(jù)給定條件,利用共線向量的坐標(biāo)表示判斷A;求出投影向量判斷B;利用向量的坐標(biāo)運(yùn)算判斷C;利用數(shù)量積的運(yùn)算律結(jié)合坐標(biāo)運(yùn)算判斷D作答.【詳解】向量,SKIPIF1<0,SKIPIF1<0,對(duì)于A,SKIPIF1<0,A正確;對(duì)于B,因?yàn)镾KIPIF1<0,則SKIPIF1<0在SKIPIF1<0上的投影向量為SKIPIF1<0,B正確;對(duì)于C,SKIPIF1<0,假定存在θ,使得SKIPIF1<0,則有SKIPIF1<0,而SKIPIF1<0,即SKIPIF1<0不成立,因此不存在θ,使得SKIPIF1<0,C錯(cuò)誤;對(duì)于D,SKIPIF1<0,即SKIPIF1<0,則SKIPIF1<0,因此存在θ,使得SKIPIF1<0,D正確.故選:ABD10.給出下列命題,其中正確的是(
)A.對(duì)于獨(dú)立性檢驗(yàn)SKIPIF1<0的值越大,說明兩事件相關(guān)程度越大.B.若隨機(jī)變量SKIPIF1<0,則SKIPIF1<0C.若SKIPIF1<0,則D.已知樣本點(diǎn)SKIPIF1<0組成一個(gè)樣本,得到回歸直線方程SKIPIF1<0,且SKIPIF1<0,剔除兩個(gè)樣本點(diǎn)SKIPIF1<0和SKIPIF1<0得到新的回歸直線的斜率為SKIPIF1<0,則新的回歸方程為SKIPIF1<0【答案】BD【分析】由獨(dú)立性檢驗(yàn)判斷選項(xiàng)A,由正態(tài)分布的對(duì)稱性,判斷選項(xiàng)B,由二項(xiàng)分布的方差公式,判斷選項(xiàng)C,由回歸直線方程的求法,判斷選項(xiàng)D.【詳解】選項(xiàng)A,對(duì)于獨(dú)立性檢驗(yàn)SKIPIF1<0的值越大,說明這兩事件具有相關(guān)性的把握越大,錯(cuò)誤;選項(xiàng)B,SKIPIF1<0,SKIPIF1<0,正確;選項(xiàng)C,SKIPIF1<0,則SKIPIF1<0,SKIPIF1<0,錯(cuò)誤;選項(xiàng)D,把SKIPIF1<0代入回歸直線方程SKIPIF1<0,得SKIPIF1<0,剔除兩個(gè)樣本點(diǎn)SKIPIF1<0和SKIPIF1<0后,新的平均數(shù)SKIPIF1<0,又新的回歸直線的斜率為SKIPIF1<0,即SKIPIF1<0,則SKIPIF1<0,解得SKIPIF1<0,則新的回歸方程為SKIPIF1<0,正確;故選:BD11.圓M:SKIPIF1<0關(guān)于直線SKIPIF1<0對(duì)稱,記點(diǎn)SKIPIF1<0,下列結(jié)論正確的是(
)A.點(diǎn)P的軌跡方程為SKIPIF1<0 B.以PM為直徑的圓過定點(diǎn)SKIPIF1<0C.SKIPIF1<0的最小值為6 D.若直線PA與圓M切于點(diǎn)A,則【答案】AB【分析】由題意可知SKIPIF1<0過圓心,代入即可得SKIPIF1<0作出圖象,利用直線與圓的關(guān)系依次判斷各選項(xiàng)即可求得結(jié)果.【詳解】圓M:SKIPIF1<0配方得:SKIPIF1<0,SKIPIF1<0圓M關(guān)于直線SKIPIF1<0對(duì)稱,SKIPIF1<0直線SKIPIF1<0過圓心SKIPIF1<0.SKIPIF1<0SKIPIF1<0,即SKIPIF1<0SKIPIF1<0點(diǎn)P的軌跡方程為SKIPIF1<0,A正確.由SKIPIF1<0,則SKIPIF1<0,則以PM為直徑的圓過定點(diǎn)SKIPIF1<0,B正確.SKIPIF1<0的最小值即為SKIPIF1<0到直線SKIPIF1<0的距離,由于SKIPIF1<0,則SKIPIF1<0,C錯(cuò)誤.由于SKIPIF1<0,要使SKIPIF1<0取最小,即SKIPIF1<0取最小值,SKIPIF1<0,SKIPIF1<0,則D錯(cuò)誤.故選:AB12.在棱長(zhǎng)為2的正方體SKIPIF1<0中,點(diǎn)E,F(xiàn)分別為棱BC與SKIPIF1<0的中點(diǎn),則下列選項(xiàng)正確的有(
)A.SKIPIF1<0平面SKIPIF1<0B.SKIPIF1<0與SKIPIF1<0所成的角為30°C.平面SKIPIF1<0D.平面SKIPIF1<0截正方體SKIPIF1<0的截面面積為SKIPIF1<0【答案】ABD【分析】設(shè)點(diǎn)M為棱SKIPIF1<0的中點(diǎn),得到四邊形SKIPIF1<0為平行四邊形,利用線面平行的判定定理,證得SKIPIF1<0平面SKIPIF1<0,可判定A正確;再得到四邊形SKIPIF1<0為菱形,求得截面的面積,可判定D正確;設(shè)SKIPIF1<0的中點(diǎn)為N,證得SKIPIF1<0,得到SKIPIF1<0為SKIPIF1<0與SKIPIF1<0所成的角,利用余弦定理求得SKIPIF1<0,可判定B正確;假設(shè)SKIPIF1<0平面SKIPIF1<0正確,得到SKIPIF1<0,結(jié)合SKIPIF1<0,證得SKIPIF1<0平面SKIPIF1<0,得到SKIPIF1<0,進(jìn)而判定C錯(cuò)誤.【詳解】如圖1所示,設(shè)點(diǎn)M為棱SKIPIF1<0的中點(diǎn),則SKIPIF1<0平行且相等,所以四邊形SKIPIF1<0為平行四邊形,又SKIPIF1<0,SKIPIF1<0平面SKIPIF1<0,SKIPIF1<0平面SKIPIF1<0,所以SKIPIF1<0平面SKIPIF1<0,故A正確;由上可知,四邊形SKIPIF1<0為平面SKIPIF1<0截正方體SKIPIF1<0的截面,易得SKIPIF1<0,故四邊形SKIPIF1<0為菱形,又其對(duì)角線SKIPIF1<0,SKIPIF1<0,故其面積為SKIPIF1<0,故D正確;設(shè)SKIPIF1<0的中點(diǎn)為SKIPIF1<0,連接SKIPIF1<0,因?yàn)镾KIPIF1<0分別為SKIPIF1<0與SKIPIF1<0的中點(diǎn),所以SKIPIF1<0,故SKIPIF1<0為SKIPIF1<0與SKIPIF1<0所成的角,又SKIPIF1<0,SKIPIF1<0,由余弦定理可得SKIPIF1<0,所以SKIPIF1<0與SKIPIF1<0所成的角為SKIPIF1<0,故B正確;如圖2所示,假設(shè)SKIPIF1<0平面SKIPIF1<0正確,則SKIPIF1<0,又SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0平面SKIPIF1<0,得SKIPIF1<0.在正方形SKIPIF1<0中,SKIPIF1<0,顯然不成立,所以假設(shè)錯(cuò)誤,即SKIPIF1<0平面SKIPIF1<0錯(cuò)誤,故C錯(cuò)誤.故選:ABD.第Ⅱ卷三、填空題:本題共4小題,每小題5分,共20分13.為了做好疫情防控期間的校園消毒工作,某學(xué)校對(duì)教室進(jìn)行消毒,室內(nèi)每立方米空氣中的含藥量y(單位:毫克)隨時(shí)間x(單位:小時(shí))的變化情況如圖所示,在藥物釋放的過程中,y與x成正比;藥物釋放完畢后,y與x的函數(shù)關(guān)系式為SKIPIF1<0(a為常數(shù)),根據(jù)測(cè)定,當(dāng)空氣中每立方米的含藥量降低到SKIPIF1<0毫克以下時(shí),學(xué)生方可進(jìn)教室學(xué)習(xí),那么從藥物釋放開始,至少需要經(jīng)過___________小時(shí)后,學(xué)生才能回到教室.【答案】0.6【分析】根據(jù)函數(shù)圖象經(jīng)過點(diǎn)SKIPIF1<0,求出SKIPIF1<0的值,然后利用指數(shù)函數(shù)的單調(diào)性解不等式SKIPIF1<0即可.【詳解】由題意知,點(diǎn)SKIPIF1<0在函數(shù)SKIPIF1<0的圖象上,所以SKIPIF1<0,解得SKIPIF1<0,所以SKIPIF1<0,由SKIPIF1<0,即SKIPIF1<0得SKIPIF1<0,所以SKIPIF1<0.所以從藥物釋放開始,到學(xué)生回到教室至少需要經(jīng)過的SKIPIF1<0小時(shí).故答案為:SKIPIF1<0.14.已知函數(shù)SKIPIF1<0的定義域?yàn)镾KIPIF1<0,其導(dǎo)函數(shù)為SKIPIF1<0,若SKIPIF1<0.SKIPIF1<0,則關(guān)于x的不等式SKIPIF1<0的解集為__________.【答案】SKIPIF1<0【分析】根據(jù)給定條件,構(gòu)造函數(shù)SKIPIF1<0,再利用函數(shù)探討單調(diào)性,求解不等式作答.【詳解】令函數(shù)SKIPIF1<0,則SKIPIF1<0,因此函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞減,SKIPIF1<0,因此SKIPIF1<0,即SKIPIF1<0,解得SKIPIF1<0,所以不等式SKIPIF1<0的解集為SKIPIF1<0.故答案為:SKIPIF1<0已知橢圓SKIPIF1<0,SKIPIF1<0、SKIPIF1<0為SKIPIF1<0的左、右焦點(diǎn),SKIPIF1<0是橢圓上的動(dòng)點(diǎn),則SKIPIF1<0內(nèi)切圓半徑的最大值為________.【答案】SKIPIF1<0【分析】根據(jù)橢圓定義可得SKIPIF1<0,結(jié)合內(nèi)切圓半徑SKIPIF1<0,顯然當(dāng)SKIPIF1<0為短軸頂點(diǎn)時(shí)SKIPIF1<0最大,即SKIPIF1<0內(nèi)切圓半徑的最大,此時(shí)SKIPIF1<0,代入求解.【詳解】∵SKIPIF1<0,則SKIPIF1<0∴SKIPIF1<0的周長(zhǎng)SKIPIF1<0∵SKIPIF1<0內(nèi)切圓半徑SKIPIF1<0,則SKIPIF1<0內(nèi)切圓半徑的最大即為SKIPIF1<0最大顯然當(dāng)SKIPIF1<0為短軸頂點(diǎn)時(shí)SKIPIF1<0最大,此時(shí)SKIPIF1<0則SKIPIF1<0故答案為:SKIPIF1<0.16.已知SKIPIF1<0是定義在SKIPIF1<0上的奇函數(shù),且SKIPIF1<0在SKIPIF1<0上單調(diào)遞減,SKIPIF1<0為偶函數(shù),若SKIPIF1<0在SKIPIF1<0上恰好有4個(gè)不同的實(shí)數(shù)根SKIPIF1<0,則SKIPIF1<0_______.【答案】24【分析】由題設(shè)可得SKIPIF1<0的周期為8,且關(guān)于SKIPIF1<0對(duì)稱的奇函數(shù),結(jié)合區(qū)間單調(diào)性判斷SKIPIF1<0上單調(diào)情況,根據(jù)SKIPIF1<0與SKIPIF1<0有4個(gè)交點(diǎn),及函數(shù)的對(duì)稱性求根的和.【詳解】由SKIPIF1<0為偶函數(shù),則SKIPIF1<0,故SKIPIF1<0,又SKIPIF1<0是定義在SKIPIF1<0上的奇函數(shù),則SKIPIF1<0,所以SKIPIF1<0,故SKIPIF1<0,即有SKIPIF1<0,綜上,SKIPIF1<0的周期為8,且關(guān)于SKIPIF1<0對(duì)稱的奇函數(shù),由SKIPIF1<0在SKIPIF1<0上單調(diào)遞減,結(jié)合上述分析知:在SKIPIF1<0上遞增,SKIPIF1<0上遞減,SKIPIF1<0上遞增,所以SKIPIF1<0在SKIPIF1<0的大致草圖如下:要使SKIPIF1<0在SKIPIF1<0上恰好有4個(gè)不同的實(shí)數(shù)根,即SKIPIF1<0與SKIPIF1<0有4個(gè)交點(diǎn),所以,必有兩對(duì)交點(diǎn)分別關(guān)于SKIPIF1<0對(duì)稱,則SKIPIF1<0.故答案為:24四、解答題:本小題共6小題,共70分,其中第17題10分,18~22題12分。解答應(yīng)寫出文字說明、證明過程或演算步驟.17.在銳角SKIPIF1<0中,SKIPIF1<0分別為內(nèi)角SKIPIF1<0的對(duì)邊,SKIPIF1<0,角SKIPIF1<0的平分線交SKIPIF1<0于SKIPIF1<0,SKIPIF1<0.(1)求SKIPIF1<0;(2)求SKIPIF1<0外接圓面積的最小值.【答案】(1)SKIPIF1<0(2)SKIPIF1<0【分析】(1)對(duì)于題干條件SKIPIF1<0,結(jié)合余弦定理,正弦定理進(jìn)行邊角轉(zhuǎn)化后求解;(2)結(jié)合角平分線長(zhǎng)度,面積的等量關(guān)系SKIPIF1<0,得出SKIPIF1<0滿足的條件,進(jìn)而由余弦定理得到SKIPIF1<0的范圍,然后由正弦定理得出外接圓半徑的最小值.【詳解】(1)SKIPIF1<0,SKIPIF1<0,由余弦定理SKIPIF1<0可得,SKIPIF1<0,化簡(jiǎn)得,SKIPIF1<0,由正弦定理SKIPIF1<0可得SKIPIF1<0,SKIPIF1<0,SKIPIF1<0.(2)由(1)得SKIPIF1<0,SKIPIF1<0.SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,整理得SKIPIF1<0.由基本不等式,SKIPIF1<0,SKIPIF1<0(當(dāng)且僅當(dāng)SKIPIF1<0時(shí)等號(hào)成立),SKIPIF1<0,SKIPIF1<0,SKIPIF1<0外接圓的直徑SKIPIF1<0,SKIPIF1<0,當(dāng)且僅當(dāng)SKIPIF1<0時(shí),SKIPIF1<0外接圓的面積取最小值SKIPIF1<0.18.已知函數(shù)SKIPIF1<0,等比數(shù)列SKIPIF1<0的前n項(xiàng)和為SKIPIF1<0,數(shù)列SKIPIF1<0SKIPIF1<0的首項(xiàng)為c,且前n項(xiàng)和SKIPIF1<0滿足SKIPIF1<0SKIPIF1<0.(1)求數(shù)列SKIPIF1<0和SKIPIF1<0的通項(xiàng)公式;(2)若數(shù)列SKIPIF1<0前n項(xiàng)和為SKIPIF1<0,求使SKIPIF1<0的最小正整數(shù)n.【答案】(1)SKIPIF1<0,SKIPIF1<0;(2)337.【分析】(1)由已知求出SKIPIF1<0,即可求出SKIPIF1<0,進(jìn)而得到SKIPIF1<0的通項(xiàng)公式.求出SKIPIF1<0,根據(jù)已知可推出SKIPIF1<0,數(shù)列SKIPIF1<0構(gòu)成等差數(shù)列,可推出SKIPIF1<0.根據(jù)SKIPIF1<0與SKIPIF1<0的關(guān)系,即可得出SKIPIF1<0的通項(xiàng)公式;(2)裂項(xiàng)可得SKIPIF1<0,相加即可得出SKIPIF1<0.解不等式SKIPIF1<0,即可得出答案.【詳解】(1)由已知可得,等比數(shù)列SKIPIF1<0的前n項(xiàng)和為SKIPIF1<0.則SKIPIF1<0,SKIPIF1<0,SKIPIF1<0.因?yàn)閿?shù)列SKIPIF1<0是等比數(shù)列,應(yīng)有SKIPIF1<0,解得SKIPIF1<0,SKIPIF1<0.所以首項(xiàng)SKIPIF1<0,等比數(shù)列SKIPIF1<0的通項(xiàng)公式為SKIPIF1<0.因?yàn)镾KIPIF1<0SKIPIF1<0,又SKIPIF1<0,所以SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0.又SKIPIF1<0,所以數(shù)列SKIPIF1<0構(gòu)成一個(gè)首項(xiàng)為1,公差為1的等差數(shù)列,所以SKIPIF1<0,則SKIPIF1<0.當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,又SKIPIF1<0時(shí)也適合上式,所以SKIPIF1<0的通項(xiàng)公式SKIPIF1<0.(2)由(1)可知,SKIPIF1<0,所以,SKIPIF1<0SKIPIF1<0SKIPIF1<0.由SKIPIF1<0,得SKIPIF1<0,得SKIPIF1<0,故滿足SKIPIF1<0的最小正整數(shù)為337.19.如圖1,在SKIPIF1<0中,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0為SKIPIF1<0的中點(diǎn),SKIPIF1<0為SKIPIF1<0上一點(diǎn),且SKIPIF1<0.現(xiàn)將SKIPIF1<0沿SKIPIF1<0翻折到SKIPIF1<0,如圖2.(1)證明:SKIPIF1<0.(2)已知二面角SKIPIF1<0為SKIPIF1<0,在棱SKIPIF1<0上是否存在點(diǎn)SKIPIF1<0,使得直線SKIPIF1<0與平面SKIPIF1<0所成角的正弦值為SKIPIF1<0?若存在,確定SKIPIF1<0的位置;若不存在,請(qǐng)說明理由.【答案】(1)證明見解析(2)存在,SKIPIF1<0【分析】(1)翻折前,在SKIPIF1<0中,SKIPIF1<0,翻折后,有SKIPIF1<0,SKIPIF1<0,利用線面垂直的判定和性質(zhì)可證得結(jié)論成立;(2)由二面角的定義可得SKIPIF1<0,然后以點(diǎn)SKIPIF1<0為坐標(biāo)原點(diǎn),SKIPIF1<0、SKIPIF1<0所在直線為SKIPIF1<0、SKIPIF1<0軸,過點(diǎn)SKIPIF1<0且垂直于平面SKIPIF1<0的直線為SKIPIF1<0軸建立空間直角坐標(biāo)系,設(shè)SKIPIF1<0,其中SKIPIF1<0,利用空間向量法可得出關(guān)于SKIPIF1<0的等式,解出SKIPIF1<0的值,即可得出結(jié)論.【詳解】(1)證明:翻折前,在SKIPIF1<0中,SKIPIF1<0,翻折后,有SKIPIF1<0,SKIPIF1<0,又SKIPIF1<0,SKIPIF1<0、SKIPIF1<0平面SKIPIF1<0,所以SKIPIF1<0平面SKIPIF1<0,因?yàn)镾KIPIF1<0平面SKIPIF1<0,所以SKIPIF1<0.(2)解:因?yàn)槎娼荢KIPIF1<0為SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,所以,二面角SKIPIF1<0的平面角為SKIPIF1<0,以點(diǎn)SKIPIF1<0為坐標(biāo)原點(diǎn),SKIPIF1<0、SKIPIF1<0所在直線為SKIPIF1<0、SKIPIF1<0軸,過點(diǎn)SKIPIF1<0且垂直于平面SKIPIF1<0的直線為SKIPIF1<0軸建立如下圖所示的空間直角坐標(biāo)系,不妨設(shè)SKIPIF1<0,則SKIPIF1<0、SKIPIF1<0、SKIPIF1<0、SKIPIF1<0、SKIPIF1<0.SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0.設(shè)SKIPIF1<0,SKIPIF1<0,其中SKIPIF1<0,設(shè)平面SKIPIF1<0的法向量為SKIPIF1<0,由SKIPIF1<0得SKIPIF1<0,取SKIPIF1<0,可得SKIPIF1<0,SKIPIF1<0,解得SKIPIF1<0,合乎題意,故當(dāng)SKIPIF1<0時(shí),直線SKIPIF1<0與平面SKIPIF1<0所成角的正弦值為SKIPIF1<0.20.2022年冬季奧林匹克運(yùn)動(dòng)會(huì)主辦城市是北京,北京成為第一個(gè)舉辦過夏季奧林匹克運(yùn)動(dòng)會(huì)和冬季奧林匹克運(yùn)動(dòng)會(huì)以及亞洲運(yùn)動(dòng)會(huì)三項(xiàng)國(guó)際賽事的城市!為迎接冬奧會(huì)的到來,某地很多中小學(xué)開展了模擬冬奧會(huì)賽事的活動(dòng),為了深入了解學(xué)生在“自由式滑雪”和“單板滑雪”兩項(xiàng)活動(dòng)的參與情況,在該地隨機(jī)選取了10所學(xué)校進(jìn)行研究,得到如下數(shù)據(jù):(1)在這10所學(xué)校中隨機(jī)選取3所來調(diào)查研究,求這3所學(xué)校參與“自由式滑雪”都超過40人的概率;(2)“單板滑雪”參與人數(shù)超過45人的學(xué)??梢宰鳛椤盎貙W(xué)?!?,現(xiàn)在從這10所學(xué)校中隨機(jī)選出3所,記SKIPIF1<0為選出可作“基地學(xué)?!钡膶W(xué)校個(gè)數(shù),求X的分布列和數(shù)學(xué)期望;(3)現(xiàn)在有一個(gè)“單板滑雪”集訓(xùn)營(yíng),對(duì)“滑行、轉(zhuǎn)彎、停止”這3個(gè)動(dòng)作技巧進(jìn)行集訓(xùn),且在集訓(xùn)中進(jìn)行了多輪測(cè)試.規(guī)定:在一輪測(cè)試中,這3個(gè)動(dòng)作中至少有2個(gè)動(dòng)作達(dá)到“優(yōu)秀”,則該輪測(cè)試記為“優(yōu)秀”.在集訓(xùn)測(cè)試中,小明同學(xué)3個(gè)動(dòng)作中每個(gè)動(dòng)作達(dá)到“優(yōu)秀”的概率均為SKIPIF1<0,每個(gè)動(dòng)作互不影響且每輪測(cè)試互不影響.如果小明同學(xué)在集訓(xùn)測(cè)試中要想獲得“優(yōu)秀”的次數(shù)的平均值達(dá)到5次,那么理論上至少要進(jìn)行多少輪測(cè)試?【答案】(1)SKIPIF1<0;(2)分布列見解析;SKIPIF1<0(3)SKIPIF1<0【分析】(1)利用古典概型結(jié)合組合公式求解;(2)寫出SKIPIF1<0的可能取值,利用超幾何分布求得分布列,利用數(shù)學(xué)期望公式求得期望;(3)先計(jì)算得小明同學(xué)一輪測(cè)試得“優(yōu)秀”的概率,再利用二項(xiàng)分布的期望公式列不等式求解.【詳解】(1)記“從10所學(xué)校中隨機(jī)選取3所學(xué)校參與“自由式滑雪”都超過40人”為事件A,參與“自由式滑雪”的人數(shù)超過40人的學(xué)校共4所,隨機(jī)選擇3所學(xué)校共SKIPIF1<0種,所以SKIPIF1<0.(2)SKIPIF1<0的所有可能取值為SKIPIF1<0,參與“單板滑雪”人數(shù)在45人以上的學(xué)校共4所,所以SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0的分布列如下表:SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0所以SKIPIF1<0.(3)記“小明同學(xué)在一輪測(cè)試中要想獲得優(yōu)秀”為事件B,則SKIPIF1<0,由題意,小明同學(xué)在集訓(xùn)測(cè)試中獲得“優(yōu)秀”的次數(shù)服
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