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江苏省海州高级中学2015届高三暑期学情摸底考试数学试题 Word版含答案

江苏省海州高级中学2015届高三暑期学情摸底考试数学试题 Word版含答案
江苏省海州高级中学2015届高三暑期学情摸底考试数学试题 Word版含答案

江苏省海州高级中学2015届高三暑期学情摸底考试数学试题

一、填空题:本大题共14小题,每小题5分,共计70分.请把答案填写在答题纸相应位置.......上.

. 1.设全集{|1}U x x =>,集合A U ?.若U A =e{|9}x x >,则集合A = . 答案:{}19x x <≤.

2.已知复数z 3i a =+(i 为虚数单位,a 0>),若2z 是纯虚数,则a 的值为 . 答案:

3.

3.抛物线2y x =的焦点到准线的距离为 . 答案:1.

4.命题“ ? x ∈R ,| x | +x 2

≥ 0 ”的否定..是 . 答案:否定为“?x 0∈R ,|x 0|+x 20<0”. 5.设a =log 37,b = 1.1

2

,c =0.83.1,则a b c 、、从小到大排列为 .

答案:c <a <b .

6.从某校高三年级随机抽取一个班,对该班45名学生的高校招生体检表中视力情况进行统计,其结果的频率分布直方图如右图.若某高校A 专业对视力的要求在0.9以上,则该班学生中能报A 专业的人数为 . 答案:18.

7.一个长方体的各顶点均在同一球面上,且一个顶点上的三条棱的长分别为1,2,3,则此球的表面积为 . 答案:π14.

8.已知圆O :52

2

=+y x ,直线l :cos sin 1x y θθ+=(02

π

θ<<

),设圆O 上到直线l 的距离等于1的点的个数为k ,则k = .

答案:4.

9.若将函数f (x )=sin 2 x +cos 2 x 的图像向右平移?个单位,所得图像关于y 轴对称,则?的最小正值是 . 答案:φ

min

=3π8.

10.有5条线段,其长度分别为1,3,5,7,9.现从中任取3条,恰能构成三角形的概率为 . 答案:310

.

11.若函数f (x )=| x +1 |+| 2 x +a | 的最小值为3,则实数a 的值为 . 答案:-4或8.

12.设a >0,b >0,4 a +b =a b ,则在以(a ,b )为圆心,a +b 为半径的圆中,面积最小的圆的标准方程是 .

答案:(x -3)2+(y -6)2=81.

解析:∵4b +1a =1,∴(a +b )·????4b +1a =5+4a b +b a

≥5+24=9.当且仅当b =2a 时,等号成立.即b =6,a =3,∴圆的标准方程为(x -3)2+(y -6)2=81.

13.如图,偶函数()f x 的图象形如字母M ,奇函数)(x g 的图象形如字母N ,若方程:

(())0f f x =,(())0f g x =,(())0g g x =,(())0g f x =的实数根的个数分别为a 、b 、c 、

d ,则d c b a +++= .

答案:30.

14.已知 [x )表示大于x 的最小整数,例如[3)=4,[-1.3)=-1.下列命题:①函数

()[)f x x x =-的值域是(0,1];②若{}n a 是等差数列,则{[)}n a 也是等差数列;③若{}n a 是

等比数列,则{[)}n a 也是等比数列;④若x ∈(1,2014),则方程1

[)2

x x -=

有2013个根.其中,正确命题的序号是 . 答案:①.

二、解答题:本大题共6小题,共计90分.请在答题纸指定位置.......内作答,解答时应写出文字说明、证明过程或演算步骤. 15.(本小题满分14分) 已知函数()3sin(2)6

f x x π

=+

的部分图象如图所示.

(1)写出()f x 的最小正周期及图中0x 、0y 的值; (2)求()f x 在区间 [2

π

-

,12

π

-

]上的最大值和最小值.

)

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