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y=by=b一

2019年福中畢測(cè)數(shù)(科試解第卷選題本題12小題,每題5分共60分在小給的個(gè)選中只一項(xiàng)符題要的1.知集合Axx1

2

x20

,則

=(A.

1

B.

x1x

C.

1x

D.

x12.復(fù)數(shù)zz3i|z|(A.

C.2

D.23.

為弘揚(yáng)中華民族傳統(tǒng)文化,某中學(xué)生會(huì)對(duì)本校高一年級(jí)1000名生課余時(shí)間參加傳統(tǒng)文化活動(dòng)的情況,隨機(jī)抽取50名學(xué)行調(diào)查,將數(shù)據(jù)分組整理后,列表如下:參加場(chǎng)數(shù)246參加人數(shù)占調(diào)查人數(shù)的百分比8%10%20%26%18%12%

4%2%估計(jì)該校高一學(xué)生參加傳統(tǒng)文化動(dòng)情況正確的是參活動(dòng)次數(shù)是3場(chǎng)生約加活動(dòng)次數(shù)是2場(chǎng)4場(chǎng)生約為人加活動(dòng)次數(shù)不高于場(chǎng)的生為280參活動(dòng)次數(shù)不低于場(chǎng)的生為360

.4.知雙曲線

:

2ya2b2

0)

,直線與

的兩條漸近線的交點(diǎn)分別為M

為坐標(biāo)原點(diǎn).若

為直角三角形,則C

的離心率為(A.

2

B.

3

C.

2

D.

55.知數(shù)列

a中n3

=2,7

數(shù)列}為數(shù)列,則a=(9nA.

12

B.

54

C.

45

D.

456.知

sin(

6

)

1,且,22

)

(第共23頁

已知函數(shù)xf

f

C.1的導(dǎo)函數(shù),則函數(shù)f

的部分圖象大致為).ABD

在邊長(zhǎng)為

的等邊中,點(diǎn)M滿MA,則A

B.2

C.6

D.

如圖,線段MN是半徑為的圓O的條弦,且MN的為2在O內(nèi)將線段MN繞點(diǎn)按逆時(shí)針方向轉(zhuǎn)動(dòng),使點(diǎn)M移到圓上的新位置,繼續(xù)將線段NM繞M點(diǎn)逆時(shí)針方向轉(zhuǎn)動(dòng)使移到圓上的新位置依繼續(xù)轉(zhuǎn)動(dòng)點(diǎn)M的跡所圍成的區(qū)域是圖中陰影部分若在圓O隨機(jī)取一點(diǎn),則此點(diǎn)取自陰影部分內(nèi)的概率為(

4

-63

C.

3310.已知函

x,fx2

,當(dāng)

f

恒成立,則實(shí)數(shù)的值范圍是()

C.

11.已知

FF1

為橢圓

4

的左焦點(diǎn)P是橢圓上異于頂點(diǎn)任意一點(diǎn)點(diǎn)是

1內(nèi)切圓的圓心,過F作MPK1

于M,O

是坐標(biāo)原點(diǎn),則OM的取值范圍為(A.

3

3.12.如圖,長(zhǎng)為1正體ABCDABD的塊平面過點(diǎn)D且行于平面ACD,則木塊在平面內(nèi)正投影面積是(

32

C.

第題第頁共23頁

第卷本包必題選題部.~21題必題每試考都須答第、23題選題考根要作.二、填空題:本大題題,每小題5分,共分.把答案填在答題卡相應(yīng)位置.13.若實(shí)數(shù)y

滿足約束條件

xyxy

,則zy

的最小值等于.

xy14.知長(zhǎng)方體ABCDCD的外接球體積為

A

直線A與面C所成的角為______.15.函數(shù)()xcos象,則.

Ra的象向左平移個(gè)位長(zhǎng)度,得到一個(gè)偶函數(shù)圖16.知數(shù)列

項(xiàng)為S,

a,Sn

(為常數(shù)數(shù)

n,且n

n

,則滿足條件的的值合_.三解題解應(yīng)出字明證過或算驟17.本小題滿分分)在中=90點(diǎn)D,分在邊,BC上,CE且的積為3.(1求邊DE長(zhǎng);(2若AD,sin的.第頁共23頁

18.本小題滿分分)峰谷電是目前在城市居民當(dāng)中開展的一種電價(jià)類別.它是將一天小劃分成兩個(gè)時(shí)間段,把8—22共小時(shí)稱為峰段,執(zhí)行峰電價(jià),即電價(jià)上調(diào):—次:共10個(gè)時(shí)稱為谷段,執(zhí)行谷電價(jià),即電價(jià)下調(diào).為了進(jìn)一步了解民眾對(duì)峰谷電價(jià)的使用情況,從某市一小區(qū)機(jī)抽取了50戶戶進(jìn)行夏季用電情況調(diào)查,各戶月平均用電量以[100,300),,700),[700,度分組的率分布直方圖如下:若將小區(qū)月平均用電量不低于700度住戶稱大戶月均用電量低于度的住戶稱為一般用戶.其中,使用峰谷電價(jià)的戶數(shù)如下表:月平均用電度使用峰谷電價(jià)的戶

9132數(shù)(1估計(jì)所抽取的戶的月均用電量的眾數(shù)和平均數(shù)(同一組中的數(shù)據(jù)用該組區(qū)間的中點(diǎn)值作代表(2i)“般用”和大戶的數(shù)填入下面2的聯(lián)表:一般用戶

大用戶使用峰谷電價(jià)的用戶不使用峰谷電價(jià)的用戶(ii根據(jù)(i)的列聯(lián)表,能否有99%的握認(rèn)為“用量的高低與使峰谷電有關(guān)?第頁共23頁

附:K

())(a)(b)

,

Dk

MFA

BE19.(本小題滿分分)如圖,四棱錐E,面平ABE,邊為矩形,AD=6BE,F(xiàn)為CE上的點(diǎn),且BF面.(1求證:BE;

,AB=5

,(2設(shè)M在段,且滿足EMMD試在線段上定一點(diǎn)N,得MN

平面

,并求

的長(zhǎng)20.本小題滿分分)已知拋物線

1

py(

和圓

x+1+y

,斜角為

的直線

l

1

的焦點(diǎn)且與相.(1求

的值;(2)

M

C

的準(zhǔn)線上,動(dòng)點(diǎn)

A

1

上,

1

在A

點(diǎn)處的切線

l

軸于點(diǎn)B

,設(shè)MAMB求證:點(diǎn)N在定直線上,并求該定直線的方程.21.本小題滿分分已知函數(shù)

f()ln

x

(R)

.第頁共23頁

(1求函數(shù)

fx)

的單調(diào)區(qū)間;()

e時(shí),關(guān)于的程

f(

有兩個(gè)不同的實(shí)數(shù)解

,求證:x11

(二選考題共分請(qǐng)生第、題中選題答如果做則所第個(gè)目分22.[選修4:標(biāo)系與參數(shù)方程](10分在直角坐標(biāo)系xOy

中,直線l參數(shù)方程為

1xtyat

(t為數(shù),aR.坐標(biāo)原點(diǎn)為極點(diǎn),x

軸正半軸為極軸建立極坐標(biāo)系的坐標(biāo)方程為

交于

O,

兩點(diǎn),直線

l

與曲線C

相交于

AB

兩點(diǎn)(1求直線l的通方程和曲線的直角坐標(biāo)方程(2當(dāng)ABOP時(shí)求a值.選修4

:不等式選講]分已知不等式

2x2x

的解集為M(1求集合;(2設(shè)實(shí)數(shù)a,b,明:b.第頁共23頁

==b==b二

年班質(zhì)測(cè)數(shù)(科試參答第卷選題本題12小題每題5分共60分在小給的個(gè)項(xiàng),有項(xiàng)符題要的1.D5.C6.C7.A12.A13.已知集

A

B

=(

C.

滿足(3+i),則【簡(jiǎn)解】B14.設(shè)復(fù)數(shù)z

,所以A

B

,故選D.

B.

C.2

2【簡(jiǎn)解一】因?yàn)?/p>

z

33+i

=

,所以z

,故選【簡(jiǎn)解二】因?yàn)?3+i)z,所以(3+i)(3+i)=,以z,選B.15.

為弘揚(yáng)中華民族傳統(tǒng)文化,某中學(xué)學(xué)生會(huì)對(duì)本校高一年級(jí)1000名生課余時(shí)間參加傳統(tǒng)文化活動(dòng)的情況,隨機(jī)抽取名生進(jìn)行調(diào)查,將數(shù)據(jù)分組整理后,列表如下:參加場(chǎng)數(shù)

13456參加人數(shù)占調(diào)查人數(shù)的百分比20%26%%

4%估計(jì)該校高一學(xué)生參加傳統(tǒng)文化活動(dòng)情況正確的是參活動(dòng)次數(shù)是的學(xué)生約為人參活動(dòng)次數(shù)是2場(chǎng)或場(chǎng)學(xué)生約為人C.參加活動(dòng)次數(shù)不高于場(chǎng)的學(xué)生約為280人參活動(dòng)次數(shù)不低于場(chǎng)的學(xué)生約為人

.【簡(jiǎn)解】估計(jì)該校高一學(xué)生參加活動(dòng)次數(shù)不低于場(chǎng)學(xué)生約為:+0.12+0.04+0.02)=360

人,故選16.已知雙線C:

x2ba2

,直線與C的條漸近線的交點(diǎn)分別M,

,第頁共23頁

,且33,,且33,O

為坐標(biāo)原點(diǎn).若

為直角三角形,則C的心率為(

2

C.

【簡(jiǎn)解依意得因直角三角形,所以雙曲線的近線為

=

,即C是軸雙曲線,所以的心率

e

2

,故選A17.已知數(shù)

{}中a3

=2,

.若數(shù)列{}為差數(shù)列,則=(

12

54

C.

45

45【簡(jiǎn)解】依題意得:

a

,因?yàn)閿?shù)列{}為等數(shù)列,n所以

a17,所以978aa9

,所以

a

45

,故選C18.已知

,且cos()2C.

【簡(jiǎn)解一】由

10,62

π得,,代入cos3

得,

=

,故選【簡(jiǎn)解二】由

π122

得,

π

,所以

π

πcoscos6666

,故選.19.已知函f

f

的導(dǎo)函數(shù),則函數(shù)f

的部分圖象大致為).第頁共23頁

ABD【簡(jiǎn)解】依題意得:f

sincos為奇函數(shù),排除D,設(shè)g()則g

x

,除

B

,故選A20.在邊長(zhǎng)3

的等邊中點(diǎn)M滿足BMMA,則CMA

32

B.2

C.

D.

【簡(jiǎn)解一】依題意得:2112CMCBCA)CA,選.333232【簡(jiǎn)解二】依意得:以C為原點(diǎn),CA所在的直線為軸建平面角直角標(biāo),則53),),25所以CM,,故選D.22【簡(jiǎn)解三】依題意得:過M點(diǎn)MDAC于D,圖所示,則

B

MCM(3cos60)

,故選D.

C

D

A21.如圖,段MN是半徑為2的的條弦,且MN的為2在O內(nèi)將線段MN繞點(diǎn)按逆時(shí)針方向轉(zhuǎn)動(dòng),使點(diǎn)M移到圓上的新位置,繼續(xù)將線段NM繞M點(diǎn)逆時(shí)針方向轉(zhuǎn)動(dòng)使移到圓上的新位置依繼續(xù)轉(zhuǎn)動(dòng)點(diǎn)M的跡所圍成的區(qū)域是圖中陰影部分若在圓O隨機(jī)取一點(diǎn),則此點(diǎn)取自陰影部分內(nèi)的概率為(

4

-63

C.

33【簡(jiǎn)解一】依題意得:陰影部分的面積

1S(6

]=432P

3

,故選B.【簡(jiǎn)解二】依題意得:陰影部分的面積

S

3P

3

,故選B.第頁共23頁

12221212221222.已知函

f

,

,當(dāng)

f

成立,則實(shí)數(shù)的值范圍是()

C.

【簡(jiǎn)解】依題意得:函數(shù)

f

上單調(diào)遞減,

因?yàn)?/p>

f

,所以

,即

2x,以2(

,即

,故選B23.已知

FF1

為橢圓

4

左、右焦點(diǎn),P是圓上異于頂點(diǎn)的任意一點(diǎn)點(diǎn)是

PF

內(nèi)切圓的圓心過F作FMPK11

于M,

是坐標(biāo)原點(diǎn)

OM的取值范圍為(A.

3

3【簡(jiǎn)解】如圖,延長(zhǎng)

P,FM

相交于N

點(diǎn),連接M

,因?yàn)镵點(diǎn)是

PF

內(nèi)切圓的圓心,所以PK

平分

PF12

,∵∴

FM,PNPF,M

F

中點(diǎn),∵為FF中,為FN中,21∴

1PFPFPFFF32

,∴OM的值范圍為24.如圖棱長(zhǎng)為正體ABD的塊面過

點(diǎn)D且平行于平面

,則木塊在平面內(nèi)的正投影面積是

32

C.

第題第10頁共23頁

A2minA2min【簡(jiǎn)解長(zhǎng)1正體BCD的塊的三個(gè)面在平面內(nèi)正投影是三個(gè)全的菱形(如圖可以看成兩個(gè)邊長(zhǎng)1222=3.22

的等邊三角形,所以木塊在內(nèi)的正投影面積是第卷本包必題選題部.~21題必題每試考都須答第、23題選題考根要作.三、填空題:本大題題,每小題5分,共分.把答案填在答題卡相應(yīng)位置.13.

14.

16.

13.若實(shí)數(shù)y

滿足約束條件

xyxy

,則zy

的最小值等于______

xy【簡(jiǎn)解】依題意,可行域?yàn)槿鐖D所示的陰影部分的三

角形區(qū)域目函數(shù)化為:

x

的最小值即為

動(dòng)直線在軸的截距的最大值.通平移可知在點(diǎn)

動(dòng)直線在軸的截距最大:

xx

解得z

1,所以1722

x.

的最小值22.知長(zhǎng)方體ABCDCD的外接球體積為

A

直線A與面C所成的角為_.第11頁共23頁

00【簡(jiǎn)解】設(shè)長(zhǎng)方體ACD的接球半徑為

,因?yàn)殚L(zhǎng)方體ABCDBCD的接球體積為

3所即C=2BC2ABR,因?yàn)锽C所以AB2

因?yàn)槠矫鍮BC,以C平面所成的角為,在eq\o\ac(△,Rt)ACB中,因?yàn)?1

BC2,以B2,以ACB=11

.23.函數(shù)()xcos

Ra的象向左平移個(gè)單位長(zhǎng)度,得到一個(gè)偶函數(shù)圖象,則

______.【簡(jiǎn)解】因?yàn)?/p>

f(x)cosR

的圖象向左平移

單位長(zhǎng)度,得到偶函數(shù)圖象,所以函數(shù)

f(x)cos

的對(duì)稱軸為x

,b所以f()sin=f(0)=b因?yàn)椋裕?a24.知數(shù)列

的前n項(xiàng)為,

a,且(為數(shù).?dāng)?shù)列

滿足n

n,b

,則滿足條件的的值集合_.【簡(jiǎn)解】因?yàn)?/p>

,且S1n

a(常n所以

a

,解得

,所以

a,所以S

a

,所以

a

,所以

an

n

,因?yàn)?/p>

ab

,所以

2

,所以b+1

nn+28(nn2n

,解得

4

,又因?yàn)镹

*

,所以或n.所以,當(dāng)n=5或n=6時(shí),

n

n

,即滿足條件的的值集合為三解題解應(yīng)出字明證過或算驟第12頁共23頁

25.本小題滿分分)在中=90(1求邊DE長(zhǎng);

點(diǎn)DE分在,BC上,,的積為.(2若AD

,求sin的值.(1析】如圖,在△中

CEsinDCEDCE6所以DCE

25

,·········································································2分因?yàn)?0

所以cos1

26=,··························································分55由

得CECD2528,

DE.········································································7分(2因?yàn)锳CB=90

,所以ACD

DCEcosDCE=,··········在ADC,正弦定理得3即15

ADCD,sinsin所以sinA.·············································································12分26.本小題滿分分)峰谷電是目前在城市居民當(dāng)中開展的一種電價(jià)類別.它是將一天小劃分成兩個(gè)時(shí)間段,把8—22共小時(shí)稱為峰段,執(zhí)行峰電價(jià),即電價(jià)上調(diào):—次:共10個(gè)時(shí)稱為谷段,執(zhí)行谷電價(jià),即電價(jià)下調(diào).為了進(jìn)一步了解民眾對(duì)峰谷電價(jià)的使用情況,從某市一小區(qū)機(jī)抽取了50戶戶進(jìn)行夏季用電情況調(diào)查,各戶月平均用電量以[100,300),,700),[700,度分組的率分布直方圖如下:第13頁共23頁

若將小區(qū)月平均用電量不低于700度住戶稱大戶月均用電量低于度的住戶稱為一般用戶.其中,使用峰谷電價(jià)的戶數(shù)如下表:月平均用電度使用峰谷電價(jià)的戶

9132數(shù)(1估計(jì)所抽取的戶的月均用電量的眾數(shù)和平均數(shù)(同一組中的數(shù)據(jù)用該組區(qū)間的中點(diǎn)值作代表(2i)“般用”和大戶的數(shù)填入下面2的聯(lián)表:一般用戶

大用戶使用峰谷電價(jià)的用戶不使用峰谷電價(jià)的用戶(ii根據(jù)(i)的列聯(lián)表,能否有

的把握認(rèn)為“用量的高低與使峰谷電有關(guān)?附:K

())(a)(b)

,

第14頁共23頁

【】(1根據(jù)頻率分布直方圖的得到度到300度的頻率為:0.001200200

,·············2分估計(jì)所抽取的50的月均用電量的眾數(shù)為:

500+700

=600度·························3估

計(jì)

50

數(shù)

為:0.00056008000.001210000.0006200640(度··············································································································分(2依題意,列表如下使用峰谷電價(jià)的用戶不使用峰谷電價(jià)的用戶

一般用戶

大用戶··················································································································8分K

的觀測(cè)值

50400k3563

·····························11所以不能有

99%

的把握認(rèn)為用電量的高與使峰谷電”有關(guān).·······················12分27.(小題滿分12分如圖,四棱錐ABCD,面面ABE,邊形ABCD為形,=6,AB=5,BE=3,F(xiàn)為上點(diǎn),且平面(1求證:BE;(2設(shè)在線段DE,且滿足EM,在線段AB上

D

確定一點(diǎn)N,使得//

平面BCE

,并求

的長(zhǎng)

MF(1析】證明:

四邊形ABCD為形BCAB

A

B平面與平面ABE平面ABCD

與平面=,

E

平面ABCD,

平面ABE.··························································································分又AE面ABE,BC

.···································································································2分第15頁共23頁

面ACE面ACE,BFAE.···································································································分又

BFB

,

平面

BCE

,BF面

BCE

,面

BCE

,···························································································4分平面,AEBE

.···································································································5分(2一中點(diǎn)作MG/AD

交于點(diǎn)ABE中作//交AB于

N

點(diǎn),連

MN

(如圖),·····································································6分EM,EGBN

.//,平面BCE,面BCE

,NG/

平面

BCE

.·························································································7分同理可證,

//

平面

BCE

.MG

,

平面

MGN//

平面BCE,···············································································分又

MN

平面

MGN

,MN/

平面BCE

,························································································分N

點(diǎn)為線段上靠近點(diǎn)的一個(gè)三等分點(diǎn).················································10分,AB,=3MG

AD

,······························································11分MNMG

NG

.···························································分(2法二M點(diǎn)MG/CD交于G接在取點(diǎn)使得MG連MN(如圖),·····························································································分

/CD

EMMD2MG//CD,CD3

AB/CD,BN,//BN,MGBN,················································································7分四邊形

是平行四邊形,第16頁共23頁

11//

,··································································································分又

MN面BCE,平面BCE,MN/

平面BCE

,························································································分N

點(diǎn)為線段上靠近點(diǎn)的一個(gè)三等分點(diǎn),···············································10在△CBG,

AD

=CE63

cos

255

,··················11分BG25

255

,17

.·························································································12分28.本小題滿分分)已知拋物線:1點(diǎn)且與C相.(1求的值;

pyp0)和圓C+12,傾斜角為的直線l過C的21(2)在C的線上,動(dòng)點(diǎn)1

A在上,C在點(diǎn)的切線l交12

軸于點(diǎn)B,設(shè)MAMB求證:點(diǎn)在定直線上,并求該直線的方程.(1【解析題設(shè)直線

l

的方程為y

,···················································1分由已知得:圓C+1+

的心

(

,半徑r2···························分因?yàn)橹本€l與圓相,12所以圓心到直線l:y的離

|1

2.···································3分即

p||22

,解得p或p舍去··············································分所以p.··································································································5(2法一依意設(shè)

(m,

(知物線

1

方程為

所y所y12

x,設(shè)()

,則以

為切點(diǎn)的切線l的斜率為k2

x1

,·················································6分所以切線l的程為y2

x).································································分第17頁共23頁

x12111x12111令,yx2y=,l交y

軸于點(diǎn)坐標(biāo))

,········分所以MAxmy3),·····················································································分MB3),···························································································分∴MBm

,··············································································分∴

OMMNx,3)

設(shè)N點(diǎn)坐標(biāo)為

(,y)則,所以點(diǎn)N在直線上················································································12(2解法二:設(shè)(m,()知拋物線

C

方程為x

y,設(shè)A(x,),以為切點(diǎn)的切線l的方程為(x)②,聯(lián)立①②得:x

]

,···································································6分因?yàn)閗

kx

,所以k=,所以切線l的程為2

x(x).································································7分111令x,切l(wèi)交y軸的點(diǎn)標(biāo)為),·····················································分2所以MAxmy3),·····················································································分MB,··························································································10分∴MNMA=(xm

·················································································11∴

ONMN

,設(shè)點(diǎn)標(biāo)為

(,y,則y,所以點(diǎn)N在直線上················································································1229.本小題滿分分已知函數(shù)

f()ln

x

(R)

.(1求函數(shù)

fx)

的單調(diào)區(qū)間;()

e時(shí),關(guān)于的程

f(

有兩個(gè)不同的實(shí)數(shù)解

,求證:第18頁共23頁

xx212xx212x11

(1析f()的義域?yàn)?0,··································································1分f

ax)]x2x2x2

,···································分①當(dāng)

a時(shí)即a

時(shí),在)上f

在(1

,所以f()的調(diào)遞增區(qū)間是)

上,單調(diào)遞減區(qū)間是(1

;··························3分②當(dāng)1

,即a

時(shí),在0

,所以,函數(shù)f()單遞減區(qū)間是(0,無遞增區(qū).··············································分(2證明:設(shè)

gxf(ax)+

a

=a+lnx············································5分所以

g

a(1)

x

,··············································································分當(dāng)

時(shí),

,數(shù)g)

在區(qū)間當(dāng)x時(shí)

,數(shù)(x)

在區(qū)間

···································分所以

(x)

在x=1

處取得最大值.當(dāng)

e時(shí)方程

f(

有兩個(gè)不同的實(shí)數(shù)解

,2所以函數(shù)

(x)

的兩個(gè)不同的零點(diǎn)

x,1

,一個(gè)零點(diǎn)比1小一個(gè)零點(diǎn)比1大·················8分不妨設(shè)

0x12

,由

(x),g()得xln(),且x=ln()122

,······································分則

=1

11e=ex=a2

xx

,···························································10分所以

xx1ex+1=x1212

,令

+=t1

,(t)=

et

,

eet(ttt2

.第19頁共23頁

2222t+x1212

,

所以

,·································································································11所以函數(shù)

在區(qū)間

上單調(diào)遞增,

(t

,所以

xxe(+x)e1=xa224411

,又因?yàn)?/p>

x+x所xx12

.································································12分(二選考題共分請(qǐng)生第、題中選題答如果做則所第個(gè)目分22.[選修4

:坐標(biāo)系與參數(shù)方程](分)在直角坐標(biāo)系xOy

中,直線

l

1xt的參數(shù)方程為(yat

t

為參數(shù),

aR

.坐標(biāo)原點(diǎn)為極點(diǎn),x

軸正半軸為極軸建立極坐標(biāo)系

的極坐標(biāo)方程為4cos

與曲線C交于P兩,直線l與線相于AB兩點(diǎn)(1求直線

l

的普通方程和曲線的直角坐標(biāo)方程;(2當(dāng)

時(shí),求

的值【解析)直線l參數(shù)方程化為普通方程為

xy

··························2分由

4cos

,···································································從而

yx即曲線的角坐標(biāo)方程為

··························(2解法一:由,

所以O(shè)P,·····························································································將直線l的數(shù)方程代入圓的方程

x

2xy

,t

23t

,得

2

··································································第20頁共23頁

33設(shè)A、兩對(duì)應(yīng)的參數(shù)為

t,

,則

t

tt43a22

·····································9分解得,a0

3

所以,所求的為0或43.·········································································10分解法二:將射線

化為普通方程為

,······················6分由()知,曲線C:

2

的心C

,半徑為2,由點(diǎn)到直線距離公式,得C

到該射線的最短距離為:

33

,所以該射線與曲線C

相交所得的弦長(zhǎng)為

OP2

.·························7分圓心C

到直線

l

的距離為:

233

22

,··············································由

,得

12

,即

3

,····················9分解得,a0

3所以,所求的為0或43.·········································································10分選修4

:不等式選講]分已知不等式

x

的解集為M(1求集合;(2設(shè)實(shí)數(shù)a,b,明:b.【解析)法一:當(dāng)

x

12

時(shí),不等式化為:

,

,所以

12

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