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2018安徽对口高考数学真题

2018年安徽省对口高考数学试卷
31. 已知集合}2,1,0,2{},3,0{-==B A ,则=B A
(A )∅ (B )}0{ (C )}3,0{ (D )}3,2,1,0,2{- 32.函数3-=
x y 的定义域是
(A )}3{≥x x (B )}3{>x x (C )}3{≤x x (D )}3{<x x 33.过B(2,3)A(-1,2),两点的直线的斜率为
(A )3- (B )3 (C )31-
(D )31 34.已知向量b a ,的夹角0
60,且4,2==b a ,则=⋅b a
(A )8 (B )34 (C )24 (D )4 35.=0
390sin (A )21-
(B )23- (C )2
1
(D )23
36.椭圆14
22
=+y x 的离心率是 (A )
23 (B )21 (C )43 (D )4
3 37.函数)2
2sin(π
+=x y 的最小正周期是
(A )
2
π
(B )π (C )π2 (D )π4 38.不等式31<+x 的解集是
(A )}24{<<-x x (B )}24{>-<x x x 或 (C )}42{<<-x x (D )}42{>-<x x x 或 39.在等比数列}{n a 中,8
1
,141==a a ,则该数列的公比=q (A )
41 (B )2
1
(C )2 (D )4
40.某校举办一项职业技能大赛,在面试环节,选手甲从A 、B 、C 、D 四道题中随机抽出两道试题作为面试题,则A 、B 同时被抽到的概率为
(A )
21 (B )31 (C )41 (D )61 41.若一球的半径为2,则该球的体积为
(A )34π (B )38π (C )316π (D )3
32π
42.已知函数⎩⎨
⎧<≥=1
,41,log 2x x x y x
,则=+)2()0(f f =a
(A )1 (B )2 (C )3 (D )4
43.若向量),2(),2,1(x b a -== ,且b a
//,则=x
(A )4 (B )1 (C )4- (D )1- 44.设R c b a ∈,,,且b a >,则下列结论正确的是 (A )2
2
b a > (B )
b
a 1
1> (C )bc ac > (D )c b c a +>+ 45.若直线02=+-y x 与直线012=++y ax 互相垂直,则=a (A )2 (B )2- (C )1 (D )1- 46.已知3
1
sin =
α,则=α2cos (A )
924 (B )924- (C )97 (D )9
7
- 47.函数x x y 22
-=的单调增区间为
(A )(]1,∞- (B )[)+∞,1 (C )(]1,-∞- (D )[)+∞-,1
48.如图所示,在正方体1111D C B A ABCD -中,点N M ,分别为111,B A AA 的中点,则直线MN 与直线1CC 所成的角等于 (A )0
30 (B )045 (C )060 (D )090
49.在一次射击测试中,甲、乙两名运动员各射击五次,命中的环数分别为:
甲:10,9,6,10,5,乙:8,9,8,8,7,记乙甲x x ,分别为甲、乙命中环数的平均数,乙甲s s ,分别为甲、乙命中环数的标准差,则下列结论正确的是
(A )乙甲x x > (B )乙甲x x < (C )乙甲s s > (D )乙甲s s < 50.在等差数列}{n a 中,13,372==a a ,则该数列前8项的和=8S (A )128 (B )92 (C )80 (D )64 51.已知3tan =α,则=+
)4
tan(π
α
(A )2- (B )2 (C )1- (D )1 52.如图所示,ABC PA 平面⊥,且0
90=∠ABC ,则下列结论错误的是
(A )AB PA ⊥ (B )AC PA ⊥ (C )PAB BC 平面⊥ (D )PBC AB 平面⊥
53.若函数)(x f 在R 上是减函数,且)()(21x f x f >,则下列结论正确的是 (A )021<-x x (B )021>-x x (C )021<+x x (D )021>+x x
54.在三角形ABC 中,角C B A 、、所对的边分别为c b a ,,,0
45,30==B A ,==b a 则,1
(A )
42 (B )2
2
(C )2 (D )22 55.若抛物线px y 22
=过点)1,1(,则抛物线的焦点坐标为
(A ))0,41( (B ))0,21( (C ))21,0( (D ))4
1,0( 56.设0>>y x ,则下列结论正确的是 (A )y
x
33< (B )y x <
(C )y x 22log log > (D )y x cos cos >
57.设B A ,为两个非空的集合,且A B ⊆,则“A x ∈”是“B x ∈”的 (A )充分条件 (B )必要条件 (C )充要条件 (D )既不充分又不必要
58.若函数)(12)(R x a x x f ∈-+=为奇函数,则=-)1(f
(A )3 (B )3- (C )2 (D )2-
59.已知直线01=+-y x l :与圆)0(:2
2
2
>=+r r y x O 相较于B A ,两点,若在圆上存在一点P ,使得PAB ∆为等边三角形,则=r
(A )1 (B )2 (C )3 (D )2
60.在同一个平面直角坐标系中,函数x
a
y )1(=与)10(log ≠>=a a x y a 且的图像可能是
参考答案 31 32 33 34 35 36 37 38 39 40 B A D D C A B A B D 41 42 43 44 45 46 47 48 49 50 D B C D A C B B C D 51 52 53 54 55 56 57 58 59 60 A D
A
C
A
C
B
D
B
C。

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