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1、有以下四个命题:
(1)y = f ( x )和y = f – 1 ( x )的图象关于直线y = x对称
(2)y = f ( x )和y = f – 1 ( x )的图象关于直线y = – x对称
(3)y = f ( x )和y = – f – 1 ( x )的图象关于直线y = – x对称
(4)y = f ( x )和y = – f – 1 ( x )的图象关于直线y = x对称
其中,正确命题的个数是( )
(A)1 (B)2 (C)3 (D)4
2、若集合{ sin α,cot α,1 }和{ sin 2 α,sin α + cos α,0 }是相同的,则sin 2005 α + cos 2005 α =( )
(A)0 (B)1 (C)± 1 (D)– 1
3、“△= a 2 – 4 b > 0,a b < 0,a – b < 0”是“方程x 4 + a x 2 + b = 0有四个实根”的( )
(A)充分而不必要条件(B)必要而不充分条件(C)充要条件(D)既不充分又不必要条件
4、Suppose that three sides of a triangle satisfy the conditions : ① The length of each side is an integer ; ② The greatest length of sides is 18 . then , the number of such triangles is( )
(A)90个 (B)91个 (C)92个 (D)171个
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