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鞍山市普通高中2022-2023學(xué)年度上學(xué)期高一質(zhì)量監(jiān)測(cè)數(shù)學(xué)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)是符合題目要求的.1.已知集合SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,那么SKIPIF1<0()A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】D【解析】【分析】根據(jù)并集、交集的定義計(jì)算可得.【詳解】∵SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,∴SKIPIF1<0,∴SKIPIF1<0.故選:D.2.命題:SKIPIF1<0,SKIPIF1<0的否定為()A.SKIPIF1<0,SKIPIF1<0 B.不存在SKIPIF1<0,SKIPIF1<0C.SKIPIF1<0,SKIPIF1<0 D.SKIPIF1<0,SKIPIF1<0【答案】D【解析】【分析】含有量詞的命題的否定方法:先改變量詞,然后再否定結(jié)論即可.【詳解】解:命題:SKIPIF1<0,SKIPIF1<0的否定為:SKIPIF1<0,SKIPIF1<0.故選:D.3.某科技攻關(guān)青年團(tuán)隊(duì)共有20人,他們的年齡分布如下表所示:年齡45403632302928人數(shù)2335241下列說法正確的是()A.29.5是這20人年齡的一個(gè)25%分位數(shù) B.29.5是這20人年齡的一個(gè)75%分位數(shù)C.36.5是這20人年齡的一個(gè)中位數(shù) D.這20人年齡的眾數(shù)是5【答案】A【解析】【分析】分別計(jì)算25%,SKIPIF1<0分位數(shù)得到A正確,B錯(cuò)誤,再計(jì)算中位數(shù)和眾數(shù)得到CD錯(cuò)誤,得到答案.【詳解】對(duì)選項(xiàng)A:SKIPIF1<0,25%分位數(shù)為SKIPIF1<0,正確;對(duì)選項(xiàng)B:SKIPIF1<0,75%分位數(shù)為SKIPIF1<0,錯(cuò)誤;對(duì)選項(xiàng)C:這20人年齡的中位數(shù)是SKIPIF1<0,錯(cuò)誤;對(duì)選項(xiàng)D:這20人年齡的眾數(shù)是SKIPIF1<0,錯(cuò)誤;故選:A4.已知函數(shù)SKIPIF1<0在區(qū)間SKIPIF1<0上有唯一零點(diǎn),則正整數(shù)SKIPIF1<0()A.8 B.9 C.10 D.11【答案】C【解析】【分析】根據(jù)函數(shù)SKIPIF1<0解析式可判斷其定義域及單調(diào)性,利用零點(diǎn)存在性定理即可求得結(jié)果.【詳解】函數(shù)SKIPIF1<0的定義域?yàn)镾KIPIF1<0,且在SKIPIF1<0上是減函數(shù);易得SKIPIF1<0,SKIPIF1<0,∴SKIPIF1<0,根據(jù)零點(diǎn)存在性定理及其單調(diào)性,可得函數(shù)SKIPIF1<0的唯一零點(diǎn)所在區(qū)間為SKIPIF1<0,∴SKIPIF1<0.故選:C.5.函數(shù)SKIPIF1<0的圖象大致為()A. B.C. D.【答案】A【解析】【分析】確定奇偶性,排除兩個(gè)選項(xiàng),再由函數(shù)值的正負(fù)排除一個(gè)選項(xiàng),得出正確結(jié)論.【詳解】記SKIPIF1<0,函數(shù)定義域?yàn)镾KIPIF1<0,則SKIPIF1<0SKIPIF1<0,函數(shù)為奇函數(shù),排除BC,又SKIPIF1<0時(shí),SKIPIF1<0,排除D.故選:A.【點(diǎn)睛】思路點(diǎn)睛:函數(shù)圖象的辨識(shí)可從以下方面入手:(1)從函數(shù)的定義域,判斷圖象的左右位置;從函數(shù)的值域,判斷圖象的上下位置.(2)從函數(shù)的單調(diào)性,判斷圖象的變化趨勢(shì);(3)從函數(shù)的奇偶性,判斷圖象的對(duì)稱性;(4)從函數(shù)的特征點(diǎn),排除不合要求的圖象.6.設(shè)SKIPIF1<0是定義在SKIPIF1<0上的偶函數(shù),且在SKIPIF1<0單調(diào)遞增,則SKIPIF1<0的解集為()A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】B【解析】【分析】根據(jù)函數(shù)的奇偶性以及單調(diào)性即可得SKIPIF1<0,解不等式即可.【詳解】由于SKIPIF1<0是偶函數(shù),且在SKIPIF1<0單調(diào)遞增,則SKIPIF1<0,有SKIPIF1<0,解得SKIPIF1<0,即不等式的解集為SKIPIF1<0,故選:B7.函數(shù)SKIPIF1<0是冪函數(shù),對(duì)任意SKIPIF1<0,且SKIPIF1<0,滿足SKIPIF1<0,若SKIPIF1<0,且SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0的值()A.恒大于0 B.恒小于0 C.等于0 D.無法判斷【答案】A【解析】【分析】確定函數(shù)在SKIPIF1<0上單調(diào)遞增,根據(jù)冪函數(shù)得到SKIPIF1<0或SKIPIF1<0,驗(yàn)證單調(diào)性得到SKIPIF1<0,代入數(shù)據(jù)計(jì)算得到答案.【詳解】對(duì)任意的SKIPIF1<0,且SKIPIF1<0,滿足SKIPIF1<0,函數(shù)是單調(diào)增函數(shù),SKIPIF1<0是冪函數(shù),可得SKIPIF1<0,解得SKIPIF1<0或SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),SKIPIF1<0;當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,不滿足單調(diào)性,排除,故SKIPIF1<0,SKIPIF1<0.SKIPIF1<0,SKIPIF1<0,故SKIPIF1<0恒成立.故選:A8.著名田園詩(shī)人陶淵明也是一個(gè)大思想家,他曾言:勤學(xué)如春起之苗,不見其增,日有所長(zhǎng);輟學(xué)如磨刀之石,不見其損,日有所虧.今天,我們可以用數(shù)學(xué)觀點(diǎn)來對(duì)這句話重新詮釋,我們可以把“不見其增”量化為每天的“進(jìn)步率”都是1%,一年后是SKIPIF1<0;而把“不見其損”量化為每天的“落后率”都是1%,一年后是SKIPIF1<0.可以計(jì)算得到,一年后的“進(jìn)步”是“落后”的SKIPIF1<0倍.那么,如果每天的“進(jìn)步率”和“落后率”都是20%,要使“進(jìn)步”是“落后”的10000倍,大約需要經(jīng)過(SKIPIF1<0,SKIPIF1<0)()A.17天 B.19天 C.21天 D.23天【答案】D【解析】【分析】根據(jù)題意得SKIPIF1<0,根據(jù)對(duì)數(shù)的運(yùn)算性質(zhì)即可求解.【詳解】經(jīng)過x天后,“進(jìn)步”與“落后”的比SKIPIF1<0,SKIPIF1<0,兩邊取以10為底的對(duì)數(shù)得SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,所以大于經(jīng)過23天后,“進(jìn)步”是“落后”10000倍.故選:D二、多項(xiàng)選擇題:本題共4小題,每小題5分,共20分.在每小題給出的四個(gè)選項(xiàng)中,有多項(xiàng)是符合題目要求的.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.在疫情防護(hù)知識(shí)競(jìng)賽中,對(duì)某校的2000名考生的參賽成績(jī)進(jìn)行統(tǒng)計(jì),可得到如圖所示的頻率分布直方圖,其中分組的區(qū)間為SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,若同一組中數(shù)據(jù)用該組區(qū)間中間值作代表值,則下列說法中正確的是()A.考生競(jìng)賽成績(jī)的平均分為72.5分B.若60分以下視為不及格,則這次知識(shí)競(jìng)賽的及格率為80%C.分?jǐn)?shù)在區(qū)間SKIPIF1<0內(nèi)的頻率為0.02D.用分層抽樣的方法從該校學(xué)生中抽取一個(gè)容量為200的樣本,則成績(jī)?cè)趨^(qū)間SKIPIF1<0應(yīng)抽取30人.【答案】AB【解析】【分析】計(jì)算平均值得到A正確,計(jì)算及格率得到B正確,分?jǐn)?shù)在區(qū)間SKIPIF1<0內(nèi)的頻率為SKIPIF1<0,C錯(cuò)誤,區(qū)間SKIPIF1<0應(yīng)抽取SKIPIF1<0人,D錯(cuò)誤,得到答案.【詳解】對(duì)選項(xiàng)A:平均成績(jī)?yōu)镾KIPIF1<0,正確;對(duì)選項(xiàng)B:及格率為SKIPIF1<0,正確;對(duì)選項(xiàng)C:分?jǐn)?shù)在區(qū)間SKIPIF1<0內(nèi)的頻率為SKIPIF1<0,錯(cuò)誤;對(duì)選項(xiàng)D:區(qū)間SKIPIF1<0應(yīng)抽取SKIPIF1<0人,錯(cuò)誤.故選:AB10.如果實(shí)數(shù)SKIPIF1<0,則下列不等式中成立的為()A.SKIPIF1<0 B.SKIPIF1<0 C.SKIPIF1<0 D.SKIPIF1<0【答案】BC【解析】【分析】利用特殊值排除錯(cuò)誤選項(xiàng),利用差比較法證明正確選項(xiàng).【詳解】令SKIPIF1<0,則SKIPIF1<0,所以A錯(cuò)誤,令SKIPIF1<0,則SKIPIF1<0,所以D選項(xiàng)錯(cuò)誤.由SKIPIF1<0,其中SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0成立,B正確.由SKIPIF1<0,其中SKIPIF1<0,所以SKIPIF1<0,所以SKIPIF1<0成立,C正確.故選:BC11.給出下述論述,其中正確的是()A.函數(shù)SKIPIF1<0與函數(shù)SKIPIF1<0表示同一個(gè)函數(shù)B.若函數(shù)SKIPIF1<0定義城為SKIPIF1<0,則函數(shù)SKIPIF1<0的定義域?yàn)镾KIPIF1<0C.函數(shù)SKIPIF1<0的單調(diào)遞減區(qū)間是SKIPIF1<0D.若函數(shù)SKIPIF1<0,則對(duì)任意SKIPIF1<0,有SKIPIF1<0【答案】BD【解析】【分析】根據(jù)定義域不同可判斷A錯(cuò)誤;由抽象函數(shù)定義域求法可得B正確;根據(jù)對(duì)數(shù)型復(fù)合函數(shù)的單調(diào)性可得C錯(cuò)誤;由函數(shù)SKIPIF1<0的解析式及基本不等式即可證明得出D正確.【詳解】對(duì)A選項(xiàng),由SKIPIF1<0可得SKIPIF1<0,解得SKIPIF1<0或SKIPIF1<0,故其定義域?yàn)镾KIPIF1<0,而SKIPIF1<0需滿足SKIPIF1<0,解得SKIPIF1<0,其定義域?yàn)镾KIPIF1<0,定義域不同,故函數(shù)不同,所以A錯(cuò)誤;對(duì)B選項(xiàng),函數(shù)SKIPIF1<0的定義城為SKIPIF1<0,即SKIPIF1<0,所以SKIPIF1<0,所以函數(shù)SKIPIF1<0的定義城為SKIPIF1<0,故B正確;對(duì)C選項(xiàng),要使SKIPIF1<0有意義,則SKIPIF1<0,解得SKIPIF1<0或SKIPIF1<0,SKIPIF1<0定義域?yàn)镾KIPIF1<0,設(shè)SKIPIF1<0,SKIPIF1<0,則SKIPIF1<0,因?yàn)镾KIPIF1<0在定義域上單調(diào)遞增;SKIPIF1<0,SKIPIF1<0的增區(qū)間為SKIPIF1<0,減區(qū)間為SKIPIF1<0,所以根據(jù)復(fù)合函數(shù)的單調(diào)性可得SKIPIF1<0的遞減區(qū)間為SKIPIF1<0,故C錯(cuò)誤;對(duì)于D選項(xiàng),因?yàn)镾KIPIF1<0,要證對(duì)任意SKIPIF1<0,有SKIPIF1<0,即證SKIPIF1<0,即證SKIPIF1<0,即證SKIPIF1<0,即證SKIPIF1<0,顯然成立,故D正確.故選:BD12.已知函數(shù)SKIPIF1<0(其中e為自然對(duì)數(shù)的底數(shù)),若存在實(shí)數(shù)SKIPIF1<0滿足SKIPIF1<0,且SKIPIF1<0,則下列說法正確的有()A.SKIPIF1<0在SKIPIF1<0上單調(diào)遞減B.SKIPIF1<0的值域?yàn)镾KIPIF1<0C.SKIPIF1<0的取值范圍是SKIPIF1<0D.SKIPIF1<0【答案】BCD【解析】【分析】作出函數(shù)SKIPIF1<0的圖象,即可判斷出選項(xiàng)AB,根據(jù)函數(shù)與方程的思想可知,函數(shù)SKIPIF1<0與函數(shù)SKIPIF1<0圖像有三個(gè)交點(diǎn),得出SKIPIF1<0之間的關(guān)系即可判斷選項(xiàng)CD從而得出結(jié)果.【詳解】作出SKIPIF1<0的圖象如下:對(duì)于選項(xiàng)A,由圖象可知SKIPIF1<0在SKIPIF1<0和SKIPIF1<0上分別單調(diào)遞減,但在其并集上不具有單調(diào)性,故A說法錯(cuò)誤;對(duì)于選項(xiàng)B,根據(jù)圖像即可得函數(shù)的值域是SKIPIF1<0,故選項(xiàng)B正確;對(duì)于選項(xiàng)D,令SKIPIF1<0,即SKIPIF1<0與函數(shù)SKIPIF1<0圖像有三個(gè)交點(diǎn),由圖可知SKIPIF1<0,故SKIPIF1<0,選項(xiàng)D正確;對(duì)于選項(xiàng)C,由SKIPIF1<0,且SKIPIF1<0,可得SKIPIF1<0,則SKIPIF1<0;令SKIPIF1<0,解得SKIPIF1<0,令SKIPIF1<0,解得SKIPIF1<0;由圖象可得SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0,故SKIPIF1<0的取值范圍是SKIPIF1<0,選項(xiàng)C正確.故選:BCD三、填空題:本大題共4小題,每小題5分,共20分.13.已知正實(shí)數(shù)SKIPIF1<0滿足SKIPIF1<0,則SKIPIF1<0的最大值為____.【答案】SKIPIF1<0;【解析】【詳解】由均值不等式的結(jié)論有:SKIPIF1<0,解得:SKIPIF1<0,當(dāng)且僅當(dāng)SKIPIF1<0時(shí)等號(hào)成立,即SKIPIF1<0的最大值為SKIPIF1<0.點(diǎn)睛:在應(yīng)用基本不等式求最值時(shí),要把握不等式成立的三個(gè)條件,就是“一正——各項(xiàng)均為正;二定——積或和為定值;三相等——等號(hào)能否取得”,若忽略了某個(gè)條件,就會(huì)出現(xiàn)錯(cuò)誤.在應(yīng)用基本不等式求最值時(shí),要把握不等式成立的三個(gè)條件,就是“一正——各項(xiàng)均為正;二定——積或和為定值;三相等——等號(hào)能否取得”,若忽略了某個(gè)條件,就會(huì)出現(xiàn)錯(cuò)誤.14.已知一個(gè)口袋有SKIPIF1<0個(gè)白球,SKIPIF1<0個(gè)黑球,這些球除顏色外全部相同,現(xiàn)從口袋中隨機(jī)逐個(gè)取出兩球,取出的兩個(gè)球是一黑一白的概率是________.【答案】SKIPIF1<0【解析】【分析】將白球和黑球分別編號(hào),列舉出所有的基本事件,利用古典概型的概率公式可計(jì)算出所求事件的概率.【詳解】將SKIPIF1<0個(gè)白球分別記為SKIPIF1<0、SKIPIF1<0、SKIPIF1<0,SKIPIF1<0個(gè)黑球記為SKIPIF1<0,從口袋中隨機(jī)逐個(gè)取出兩球,所有的基本事件有:SKIPIF1<0、SKIPIF1<0、SKIPIF1<0、SKIPIF1<0、SKIPIF1<0、SKIPIF1<0、SKIPIF1<0、SKIPIF1<0、SKIPIF1<0、SKIPIF1<0、SKIPIF1<0、SKIPIF1<0,共SKIPIF1<0個(gè),其中,事件“取出的兩個(gè)球是一黑一白”所包含的基本事件有:SKIPIF1<0、SKIPIF1<0、SKIPIF1<0、SKIPIF1<0、SKIPIF1<0、SKIPIF1<0,共SKIPIF1<0個(gè),因此,所求事件的概率為SKIPIF1<0.故答案為:SKIPIF1<0.【點(diǎn)睛】本題考查古典概型概率的計(jì)算,一般要求列舉出基本事件,考查計(jì)算能力,屬于基礎(chǔ)題.15.在平行四邊形ABCD中,點(diǎn)E滿足SKIPIF1<0,且O是邊AB中點(diǎn),若AE交DO于點(diǎn)M.且SKIPIF1<0,則SKIPIF1<0______.【答案】SKIPIF1<0【解析】【分析】由已知可得SKIPIF1<0SKIPIF1<0可得答案.【詳解】平行四邊形ABCD中,點(diǎn)E滿足SKIPIF1<0,且O邊AB中點(diǎn),所以E是邊DC離近C的三等分點(diǎn),可得SKIPIF1<0,SKIPIF1<0,所以SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0又SKIPIF1<0,所以SKIPIF1<0,故答案為:SKIPIF1<0.16.某廠商為推銷自己品牌的可樂,承諾在促銷期內(nèi),可以用3個(gè)該品牌的可樂空罐換1罐可樂.對(duì)于此促銷活動(dòng),有以下三個(gè)說法:①如果購(gòu)買10罐可樂,那么實(shí)際最多可以飲13罐可樂;②欲飲用100罐可樂,至少需要購(gòu)買67罐可樂:③如果購(gòu)買SKIPIF1<0罐可樂,那么實(shí)際最多可飲用可樂的罐數(shù)SKIPIF1<0.(其中SKIPIF1<0表示不大于x的最大整數(shù))則所有正確說法的序號(hào)是__________.【答案】②③.【解析】【分析】①SKIPIF1<0罐可樂有SKIPIF1<0個(gè)可樂空罐,第一次可換SKIPIF1<0罐可樂還剩SKIPIF1<0個(gè)空罐,第二次可換SKIPIF1<0罐可樂還剩SKIPIF1<0個(gè)空罐,由此算出最多可飲用的可樂罐數(shù);②:先分析購(gòu)買SKIPIF1<0罐可樂的情況,再分析購(gòu)買SKIPIF1<0罐可樂的情況,由此確定出至少需要購(gòu)買的可樂罐數(shù);③:先分析購(gòu)買SKIPIF1<0到SKIPIF1<0罐可樂分別可飲用多少罐可樂以及剩余空罐數(shù),然后得到規(guī)律,再分奇偶罐數(shù)對(duì)所得到的規(guī)律進(jìn)行整理,由此計(jì)算出SKIPIF1<0的結(jié)果.【詳解】①:購(gòu)買SKIPIF1<0罐可樂時(shí),第一次可換SKIPIF1<0罐還剩SKIPIF1<0個(gè)空罐,第二次可換SKIPIF1<0罐還剩SKIPIF1<0個(gè)空罐,所以最多可飲用SKIPIF1<0罐可樂,故錯(cuò)誤;②:購(gòu)買SKIPIF1<0罐時(shí),第一次可換SKIPIF1<0罐可樂,第二次可換SKIPIF1<0罐可樂還剩SKIPIF1<0個(gè)空罐,第三次可換SKIPIF1<0罐可樂還剩SKIPIF1<0個(gè)空罐,第四次可換SKIPIF1<0罐可樂還剩SKIPIF1<0個(gè)空罐,所以一共可飲用SKIPIF1<0罐;購(gòu)買SKIPIF1<0罐時(shí),第一次可換SKIPIF1<0罐可樂還剩SKIPIF1<0個(gè)空罐,第二次可換SKIPIF1<0瓶可樂還剩SKIPIF1<0個(gè)空罐,第三次可換SKIPIF1<0罐可樂,第四次可換SKIPIF1<0罐可樂還剩SKIPIF1<0個(gè)空罐,所以一共可飲用SKIPIF1<0罐;所以至少需要購(gòu)買SKIPIF1<0罐可樂,故正確;③:購(gòu)買SKIPIF1<0到SKIPIF1<0罐可樂分別可飲用可樂罐數(shù)以及剩余空罐數(shù)如下表所示:購(gòu)買數(shù)飲用數(shù)剩余空罐數(shù)SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0由表可知如下規(guī)律:(1)當(dāng)購(gòu)買的可樂罐數(shù)為奇數(shù)時(shí),此時(shí)剩余空罐數(shù)為SKIPIF1<0,當(dāng)購(gòu)買的可樂罐數(shù)為偶數(shù)時(shí),此時(shí)剩余的空罐數(shù)為SKIPIF1<0;(2)實(shí)際飲用數(shù)不是SKIPIF1<0的倍數(shù);(3)每多買SKIPIF1<0罐可樂,可多飲用SKIPIF1<0罐可樂,(4)實(shí)際飲用的可樂罐數(shù)要比購(gòu)買的可樂罐數(shù)的SKIPIF1<0倍少SKIPIF1<0或SKIPIF1<0;設(shè)購(gòu)買了SKIPIF1<0罐可樂,實(shí)際可飲用的可樂罐數(shù)為SKIPIF1<0,所以SKIPIF1<0,即SKIPIF1<0,即SKIPIF1<0,又因?yàn)镾KIPIF1<0可看作SKIPIF1<0,即不大于SKIPIF1<0的最大整數(shù),所以SKIPIF1<0成立,故正確;故答案為:②③.【點(diǎn)睛】關(guān)鍵點(diǎn)點(diǎn)睛:解答本題時(shí),一方面需要通過具體購(gòu)買的可樂罐數(shù)去分析實(shí)際飲用的可樂罐數(shù),另一方面需要對(duì)實(shí)際的購(gòu)買情況進(jìn)行歸納,由此得到購(gòu)買的可樂罐數(shù)與實(shí)際飲用的可樂罐數(shù)的關(guān)系,從而解決問題.四、解答題:本題共6小題,共70分.解答應(yīng)寫出文字說明、證明過程或演算步驟.17.已知全集SKIPIF1<0,集合SKIPIF1<0,SKIPIF1<0.(1)當(dāng)SKIPIF1<0時(shí),求SKIPIF1<0,SKIPIF1<0;(2)若“SKIPIF1<0”是“SKIPIF1<0”的充分不必要條件,求實(shí)數(shù)a的取值范圍.【答案】(1)SKIPIF1<0,SKIPIF1<0或SKIPIF1<0(2)SKIPIF1<0【解析】【分析】(1)解不等式SKIPIF1<0可得集合SKIPIF1<0,將SKIPIF1<0代入解出集合SKIPIF1<0,根據(jù)集合基本運(yùn)算即可求得結(jié)果;(2)根據(jù)題意可得集合SKIPIF1<0是集合SKIPIF1<0的真子集,根據(jù)集合間的基本關(guān)系即可求得實(shí)數(shù)a的取值范圍.【小問1詳解】解集合SKIPIF1<0對(duì)應(yīng)的不等式SKIPIF1<0可得SKIPIF1<0,即SKIPIF1<0;SKIPIF1<0或SKIPIF1<0當(dāng)SKIPIF1<0時(shí),SKIPIF1<0,所以SKIPIF1<0,SKIPIF1<0或SKIPIF1<0.【小問2詳解】由“SKIPIF1<0”是“SKIPIF1<0”的充分不必要條件可得,集合SKIPIF1<0是集合SKIPIF1<0的真子集,又SKIPIF1<0,所以SKIPIF1<0(等號(hào)不會(huì)同時(shí)成立),解得SKIPIF1<0,故實(shí)數(shù)a的取值范圍為SKIPIF1<0.18.在一個(gè)文藝比賽中,由8名專業(yè)人士和8名觀眾代表各組成一個(gè)評(píng)委小組,給參賽選手打分.下面是兩組評(píng)委對(duì)同一名選手的打分:小組A4245504749535147小組B5336714946656258(1)做出兩組評(píng)委打分的莖葉圖;(2)每一個(gè)小組內(nèi)評(píng)委打分的相似程度是不同的,我們可以用方差來進(jìn)行刻畫.請(qǐng)計(jì)算每一組數(shù)據(jù)中的方差;(3)你能根據(jù)方差判斷出小組A與小組B中哪一個(gè)更像是由專業(yè)人士組成的嗎?請(qǐng)說明理由.【答案】(1)答案見解析(2)SKIPIF1<0,SKIPIF1<0(3)A組,理由見解析【解析】【分析】(1)根據(jù)表格中數(shù)據(jù)和莖葉圖特征即可做出兩組評(píng)委打分的莖葉圖;(2)分別求出兩個(gè)小組的平均數(shù),再利用方差公司即可求得兩小組的方差;(3)根據(jù)方差的實(shí)際意義即可知A組更像是由專業(yè)人士組成的.【小問1詳解】利用表中數(shù)據(jù)即可做出莖葉圖如下:【小問2詳解】根據(jù)平均數(shù)、方差公式計(jì)算:小組A的平均數(shù)是SKIPIF1<0,即可得方差SKIPIF1<0SKIPIF1<0小組B的平均數(shù)是SKIPIF1<0,即可得方差SKIPIF1<0SKIPIF1<0即小組A的方差SKIPIF1<0,小組B的方差SKIPIF1<0.【小問3詳解】由于專業(yè)人士給分更符合專業(yè)規(guī)則,相似程度更高,由(2)可知小組A的方差SKIPIF1<0,小組B的方差SKIPIF1<0,因而SKIPIF1<0,根據(jù)方差越大數(shù)據(jù)波動(dòng)越大,因此A組更像是由專業(yè)人士組成的.19.平面內(nèi)三個(gè)向量SKIPIF1<0(1)求SKIPIF1<0(2)求滿足SKIPIF1<0的實(shí)數(shù)SKIPIF1<0(3)若SKIPIF1<0,求實(shí)數(shù)SKIPIF1<0【答案】(1)SKIPIF1<0;(2)SKIPIF1<0;(3)SKIPIF1<0.【解析】【分析】(1)利用向量加法的坐標(biāo)運(yùn)算得到SKIPIF1<0,再求模長(zhǎng)即可;(2)先寫SKIPIF1<0的坐標(biāo),再根據(jù)SKIPIF1<0使對(duì)應(yīng)橫縱坐標(biāo)相等列方程組,解方程組即得結(jié)果;(3)利用向量平行的關(guān)系,坐標(biāo)運(yùn)算列關(guān)系求出參數(shù)即可.【詳解】SKIPIF1<0因?yàn)镾KIPIF1<0所以SKIPIF1<0SKIPIF1<0由SKIPIF1<0,得SKIPIF1<0所以SKIPIF1<0解得SKIPIF1<0SKIPIF1<0SKIPIF1<0SKIPIF1<0因?yàn)镾KIPIF1<0所以SKIPIF1<0解得SKIPIF1<020.已知函數(shù)SKIPIF1<0,SKIPIF1<0(SKIPIF1<0且SKIPIF1<0),且SKIPIF1<0.(1)求實(shí)數(shù)a值;(2)設(shè)SKIPIF1<0,SKIPIF1<0,SKIPIF1<0(SKIPIF1<0的反函數(shù)),當(dāng)SKIPIF1<0時(shí),試比較SKIPIF1<0,SKIPIF1<0,SKIPIF1<0大?。敬鸢浮浚?)2(2)SKIPIF1<0【解析】【分析】(1)利用SKIPIF1<0代入計(jì)算可得SKIPIF1<0;(2)由(1)寫出SKIPIF1<0,SKIPIF1<0,SKIPIF1<0的表達(dá)式,分別利用函數(shù)單調(diào)性即可求得其在SKIPIF1<0上的取值,即可比較出大小.【小問1詳解】由SKIPIF1<0可得SKIPIF1<0,即SKIPIF1<0,解得SKIPIF1<0所以實(shí)數(shù)a的值為2.【小問2詳解】由SKIPIF1<0可得SKIPIF1<0,SKIPIF1<0,由SKIPIF1<0的反函數(shù)可得SKIPIF1<0,當(dāng)SKIPIF1<0時(shí),根據(jù)一元二次函數(shù)單調(diào)性可知,SKIPIF1<0在SKIPIF1<0上單調(diào)遞減,故其值域?yàn)镾KIPIF1<0,由對(duì)數(shù)函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,可知SKIPIF1<0,由指數(shù)函數(shù)SKIPIF1<0在SKIPIF1<0上單調(diào)遞增,可得SKIPIF1<0,所以,可得SKIPIF1<0.21.某班級(jí)體育課進(jìn)行一次籃球定點(diǎn)投籃測(cè)試,規(guī)定每人最多投3次,每次投籃的結(jié)果相互獨(dú)立.在SKIPIF1<0處每投進(jìn)一球得3分,在SKIPIF1<0處每投進(jìn)一球得2分,否則得0分.將學(xué)生得分逐次累加并用SKIPIF1<0表示,如果SKIPIF1<0的值高于3分就判定為通過測(cè)試,立即停止投籃,否則應(yīng)繼續(xù)投籃,直到投完三次為止.現(xiàn)有兩種投籃方案:方案1:先在SKIPIF1<0處投一球,以后都在SKIPIF1<0處投;方案2:都在SKIPIF1<0處投籃.已知甲同學(xué)在SKIPIF1<0處投籃的命中率為SKIPIF1<0,在SKIPIF1<0處投籃的命中率為SKIPIF1<0.(1)若甲同學(xué)選擇方案1,求他測(cè)試結(jié)束后所得總分SKIPIF1<0的所有可能的取值以及相應(yīng)的概率;(2)你認(rèn)為甲同學(xué)選擇哪種方案通過測(cè)試的可能性更大?說明理由.【答案】(1)答案見解析;(2)甲同學(xué)選擇方案2通過測(cè)試的可能性更大,理由見解析.【解析】【分析】(1)確定甲同學(xué)在A處投中為事件A,在B處第i次投中為事件SKIPIF1<0,根據(jù)題意知SKIPIF1<0,總分X的取值為0,2,3,SKIPIF1<0,利用概率知識(shí)求解相應(yīng)的概率;(2)設(shè)甲同學(xué)選擇方案1通過測(cè)試的概率為SKIPIF1<0,選擇方案2通過測(cè)試的概率為SKIPIF1<0,利用概率公式得出SKIPIF1<0,SKIPIF1<0,比較即可.【詳解】解:(1)設(shè)甲同學(xué)在SKIPIF1<0處投中為事件SKIPIF1<0,在SKIPIF1<0處第SKIPIF1<0次投中為事件SKIPIF1<0,由已知SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0的取值為0,2,3,4,則SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0,SKIPIF1<0.(2)甲同學(xué)選擇方案1通過測(cè)試的概率為SKIPIF1<0,則SKIPIF1<0,選擇方案2通過測(cè)試的概率為SKIPIF1<0,在SKIPIF1<0處第SKIPIF1<0次投中為事件SKIPIF1<0,由已知SKIPIF1<0,SKIPIF1<0,SKIPIF1<0SKIPIF1<0,因?yàn)镾KIPIF1<0,所以甲同學(xué)選擇方案2通過測(cè)試的可能性更大.22.一般地,設(shè)函數(shù)SKIPIF1<0的定義城為D,如果對(duì)D內(nèi)的任意一個(gè)x,都有SKIPIF1<0,且SKIPIF1<0,則稱SKIPIF1<0為倒函數(shù).請(qǐng)根據(jù)上述定義回答下列問題:(1)已知SKIPIF1<0,SKIPIF1<0,判斷SKIPIF1<0和SKIPIF1<0是不是倒函數(shù);(不需要說明理由)(2)若SKIPIF1<0是SKIP

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