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必修四总复习学生版

1.若1x >,则1

1

x x +

-的最小值是 ( )

A.

21

x

x - B. C.2 D.3

2.在下列函数中,最小值为2是 ( )

A.5(5

x

y x x

=+∈R 且0)x ≠ B.1

lg (110)lg y x x x

=+

<< C.33()x x y x -=+∈R D.1sin (0)sin 2

y x x x π=+

<< 3.已知,1,1x y >>且lg lg 4,x y +=则lg lg x y ?的最大值是 ( )

A.[2,2]- B.[- C.[2] D.[ 4.已知33log log 2,m n m n +=+则的最小值是( )

A. B.2 C. 6 D. 5.函数1

(0)y x x x

=+≠的值域是 ( )

A.{|22}y y -≤≤ B.{|2}y y ≥ C.{|2y y ≤-或2}y ≥ D.{|2}y y ≤- 6.已知0,0a b >>且1a b +=,则22

11

(

1)(1)a b --的最小值是 ( ) A.9 B.8 C.7 D.6 8.若x ,y 是正数,则2211

()()22x y y x

+++的最小值是( )

A .3

B .

2

7 C .4 D .

2

9

9.已知非负实数a ,b 满足2a +3b =10 )

B. C.5

D.10

10.若41x -<<,则222

22

x x y x -+=-有 ( )

A.最小值1 B.最大值1 C.最小值1- D.最大值1-

12.若0,0x y >>,且28

1x

y

+

=,则xy 有 ( ) A.最大值64 B.最小值

1

64

C.最小值12 D.最小值64

14.函数22()(42)(0f x x x x =-<的最大值是 .

15.已知x , y 满足10x y ++=,则22x y A =+的最小值是 .

16.已知01,01a b <<<<,且22log log 16a b ?=,则2log ()ab 的最大值为 . 3、已知数列{}n a ,13a =,26a =,且21n n n a a a ++=-,则数列的第100项为

A. 6

B. 3-

C. 12-

D. 6- 4、等差数列{a n }各项依次递减,且有246

45a a a =,2

4615a

a a ++=,则通项公式n a =

A .23n -

B .23n -+

C .213n -+

D .211n -+ 6、等差数列{a n }中,10a <,n S 为前n 项和,且3

16S S =,则n

S

取最小值时,n

的值 A . 10或11 B . 9或10 C .10 D .9 8、 在等比数列{a n }中,4S =1,8S =3,则20191817a a a a +++的值是

A .14

B .16

C .18

D .20

9、 数列{a n }的通项公式是a n =1

(1)

n n +(n ∈N*),若前n 项的和为1011,则项数为

A .12

B .11

C .10

D .9

11、数列{}n a 的前n项的和S n =3n 2+ n +1,则此数列的通项公式a n =__ 12、在数列{}n a 中,11a =,且对于任意自然数n ,都有1n n a a n +=+,则100a = 13、等比数列{a n }中,公比2q =,212223210log log log log 25a a a a ++++=…,

则1

2

10

a a a +++=… .

14、数列1

111

1,2,3,,,2482n

n ++++……的前n 项和是 . 三、解答题,

15、等差数列{a n }的公差为12

,且前100项和S 100=145,求a 1+a 3+a 5+…+a 99的值

16、等比数列的首项为a ,公比为q (1q ≠),n S 为前n 项和,求12n S S S +++…

17、已知:等差数列{n a }中,4a =14,前10项和18510=S .

(1)求n a ;(2)将{n a }中的第2项,第4项,…,第n 2项按原来的顺序排成一个新数列,求此数列的前n 项和n G .

18、已知等差数列{a n }的首项a 1=1,公差d >0,且第二项,第五项,第十四项分别是等

比数列{b n }的第二项,第三项,第四项.

(1)求数列{a n }与{b n }的通项公式; (2)设数列{c n }对任意自然数n ,均有

133

2211+=+??+++n n n a b c b c b c b c ,求c 1+c 2+c 3+……+c 2006值.

20、在等差数列{}n a 中,11a =,前n 项和n S 满足条件

242

,1,2,1

n n S n n S n +==+ . (Ⅰ)求数列{}n a 的通项公式;(Ⅱ)记(0)n a n n b a p p =>,求数列{}n b 的前n 项和n T .

2、设),2(2-=a a M ),3)(1(-+=a a N 则有( )

A 、N M >

B 、N M ≥

C 、N M <

D 、N M ≤ 3、不等式x x x 2522>--的解集是( )

A 、}15|{-≤≥x x x 或

B 、}15|{-<>x x x 或

C 、}51|{<<-x x

D 、}51|{≤≤-x x 4、不等式062>-+y x 表示的平面区域在直线062=-+y x ( )

A 、左上方

B 、右上方

C 、左下方

D 、右下方

6、函数4

23(0)y x x x =-->的最值情况是( )

A

、有最小值2- B

、有最大值2-C

、有最小值2+

D

、有最大值2+8、设,y x z +=式中变量x 和y 满足条件

{

30

≥-+≥-y x y x ,则z 的最小值为( ) A 、1 B 、-1 C 、3 D 、-3 10、若不等式2(2)36ax +<的解集为{|12}x x -<<,则实数a 等于 。 11、已知集合22{|160},{|430}A x x B x x x =-<=-+>,则A B = . 12、配制A 、B 两种药剂,需要甲、乙两种原料,已知配一剂A 种药需甲料3毫克,

乙料5毫克;配一剂B 种药需甲料5毫克,乙料4毫克。今有甲料20毫克,乙料25毫克,若A 、B 两种药至少各配一剂,现设A 、B 两种药分别配y x ,剂,则y x ,应满足的约束条件是 。

一、选择题:

2.在等差数列{}n a 中,已知10202=+a a ,则S 21等于( ) A .100 B .105 C .200 D .0 3.不等式0162≥++-x x 的解集是( ) A.]31,21[- B.]21,31[ C.]21,31[- D.]3

1

,21[--4.设等差数列前项和为1020,100,400,n S S S ==则30S 等于( )

(A )800 (B )900 (C )1000 (D )1100

5.已知△ABC 中,AB =6,∠A =30°,∠B =120°,则△ABC 的面积为( ) A .9

B .18

C .93

D .183

6.等比数列{}n a 中,已知12340a a a ++=,45620a a a ++=,则前9项之和等于( ) A .50 B .70 C .80 D .90

7. 若}{n a 是等比数列,124,5128374=+-=a a a a 且公比q 为整数,则10a 等于( ) A -256 B 256 C -512 D 512

8.在△ABC 中,sin A :sin B :sin C =3:2:4,则cos C 的值为( )

A .2

3 B .-23 C .1

4 D .-14

9.设M=)5)(1(--x x , N=2)3(-x , 则M 与N 的大小关系为( )

A .M>N

B .M

C .M=N

D .不能确定 10.若不等式022>+-mx mx 对一切实数x 恒成立,则实数m 的取值范围是( ) A.)8,0( B.]8,0[ C.)8,0[ D.]8,0(

11.数列{}n a 的通项n n n a 2?= ,那么它的前n 项的和n S 是( ) A .22)1(1-?--n n

B .1

(1)2

2n n +-?+

C .221+?-n n

D .221

+?+n n

二、填空题:

14.设一个等差数列,由三个数组成,三个数之和为9 ,三个数的平方和为35,则公差d = .

15.不等式0)2)(2(>+-x x x 的解集是__________________.

17..已知等差数列{}n a 满足1273-=?a a ,464a a +=-,(1)求数列{}n a 的通项公式.(2) 当数列{}n a 的公差小于零时,求n 取何值时,前n 项和n S 有最大值,并求出它的最大值.

19.设锐角三角形ABC 的内角,,A B C 的对边分别为,,a b c ,2sin a b A =

(1)求角B 的大小;(2)求cos sin A C +的范围

20.在ABC ?中,c b a ,,分别是角A 、B 、C 的对边,且

.2cos cos c

a b

C B +-= (1)求角B 的大小;(2)若4,13=+=c a b ,求ABC ?的面积.

21.正数数列{a n }的前n 项和为S n ,且2S n =a n +1.

(1) 试求数列{a n }的通项公式;(2)设b n =1

a n ·a n +1

,{b n }的前n 项和为T n ,求证:

T n <12.

22.已知函数f (x )定义在区间(-1,1)上,f (1

2)=-1,且当x ,y ∈(-1,1)时,恒

有f (x )-f (y )=f (x -y 1-xy ),又数列{a n }满足a 1=12,a n +1=2a n

1+a n

2,设b n =

1f (a 1)+1f (a 2)+…+1f (a n ).

⑴证明:f (x )在(-1,1)上为奇函数;⑵求f (a n )的表达式;

⑶是否存在正整数m ,使得对任意n ∈N ,都有b n

4成立,若存在,求出m 的最小值;若不存在,请说明理由.

一、选择题

1.已知△ABC 中,a =4,b =43,∠A =30°,则∠B 等于( ) A .30°

B .30°或150°

C .60°

D .60°或120°

2.在△ABC 中,若B A sin sin >,则A 与B 的大小关系为( )

A. B A >

B. B A <

C. A ≥B

D. A 、B 的大小关系不能确定 3.已知△ABC 中,AB =6,∠A =30°,∠B =120°,则△ABC 的面积为( ) A .9

B .18

C .93

D .183

4.在△ABC 中,sin A :sin B :sin C =3:2:4,则cos C 的值为( ) A .23

B .-23

C .14

D .-14

二、填空题

8.在△ABC 中,若AB =5,AC =5,且cos C =

10

9

,则BC =________. 9、ABC ?中,若b=2a , B=A+60°,则A= .

10.在△ABC 中,∠C =60°,a 、b 、c 分别为∠A 、∠B 、.C 的对边,则c

a b

c b a ++

+=________. 三、解答题

11.已知a =33,c =2,B =150°,求边b 的长及S △. (本小题共14分)在?ABC 中,设,2tan tan b

b

c B A -=,求A 的值。

13. 一缉私艇发现在北偏东 45方向,距离12 nmile 的海面上有一走私船正以10 nmile/h 的速度沿东偏南 15方向逃窜.缉私艇的速度为14 nmile/h, 若要在最短的时间内追上该走私船,缉私艇应沿北偏东α+ 45的方向去追,.求追及所需的时间和α角的正弦值.

1、已知a 、b ∈(0,1)且a ≠b ,则下列各式中最大的是 ( )

A 、a 2+b 2

B 、2ab

C 、2ab

D 、a+b

2、在锐角三角形中,下面答案对的是 ( )

A 、sinA > cos

B B 、sinA < cosB

C 、sinA = cosB

D 、以上都有可能 3、在△ABC 中,sinA: sinB: sinC=(3+1): (3-1) :10则最大角为 ( ) A 、900 B 、1200 C 、1350 D 、1500 4.

不等式

表示的平面区域是( )

5、设x+3y –2 =0,则函数z=3x +27y +3的最小值是 ( )

A 、33

2

B 、3+22

C 、6

D 、9

6、已知x >1,y >1且lgx+lgy=4,则lgx ·lgy 的最大值是 ( )

A 、4

B 、2

C 、1

D 、41

7、设x >0,y >0且

x 2+y

8

=1,则xy 有 ( ) A 、最大值64 B 、最小值

641 C 、最小值2

1

D 、最小值64 8、.若??

??

?≥+≤≤22

2

y x y x 则目标函数y x z 2+=取值范围是( )。

A [2,6] B[2,5] C[3,6] D[3,5]

9、不等式32<++m y x 表示的平面区域包含点(0,0)和点(-1,-1),则m 的取值范围是( )。A –3

13已知函数z=x +y ,则z 在??

??

?≥-≤≤

≤1382y x x y

x 的约束条件下的最大值是_________。 14、给出下列四个命题①x+x

1

≥2,(x >0) ②22

+x

+

2

1

2

+x

≥2,

③函数f(x)=sin α+

αsin 1 α∈(0, 2

π

)时的最小值为2;④函数f(x)= 32

+x

+

3

2

2

+x

的最小值为22。其中正确的有--------------------。

17、在△ABC 中,角A 、B 、C 所对的边a 、b 、c ,b =a cosC ,又△ABC 的最大边长为12,最小角的正弦为2

1

,(1)判断△ABC 的形状;(2)求△ABC 的面积。

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