23. , the color of the dress doesn’t you, and secondly it’s too expensive.
A.To begin with; suit B.Firstly; fit
C.Firstly of all; fit D.Above all; suit
22.Apples are usually sold by weight, and eggs are sometimes sold by dozen.
A.the; the B.the; a C./; a D./; the
第一节:单项填空(共15小题,每小题1分,满分15分)
21.-Sorry, Peter. I’m afraid that I can’t go to the cross talk show by Guo Degang with you.
- ! Who knows when he will come here next time?
A.Take it easy B.What a shame C.It doesn’t matter D.Do as you like
22.(12分)函数处取得极值,且的图象在处
的切线平行于直线
(I)求函数解要式和极值;
(II)对任意,求证。
21.(12分)高射炮击中目标的概率P与射击角度满足关系式,现有甲、乙、丙二门高射炮,每门高射炮击中目标与否相互独立,已知甲、乙、丙射击的角度分别为
。
(1)三炮同时向目标射击,求恰有两门炮击中目标的概率。
(2)现甲、乙、丙依次射击,若击中则停止射击,若击不中则下一门射击,但丙击中与否都要停止射击,求目标被击中的概率。
20.(12分)在中,a,b,c分别为的对边,已知得量,
,且m与n夹角为
(1)求。
(2)若的面积的值。
19.(12分)
设函数
(1)求的最小正周期;
(2)若函数的图像关于x=1对称,求当时的最大值。
18.(本小题满分12分)
已知
(I)求的夹角为;
(II)求