(1)已知集合U={1,2,3,4,5,6,7},A= {2,4,5,7},B = {3,4,5},则(CUA)∪(CUB)=
(A){1,6} (B){4,5}
(C){2,3,4,5,7} (D){1,2,3,6,7}
(2)在等比数列{a n}中,若a n>0且a 3a7 = 64,则a 5的值为
(A)2 (B)4
(C)6 (D)8
(3)以点(2, -1)为圆心且与直线相切的圆的方程为
(A)( x-2 )2 + ( y+1 )2 = 3 (B)( x+2 )2 + ( y-1 )2 = 3
(C)( x-2 )2 + ( y+1 )2 = 9 (D)( x+2 )2 + ( y-1 )2 = 9
(4)若P是平面外一点,则下列命题正确的是
(A)过P只能作一条直线与平面相交 (B)过P可作无数条直线与平面垂直
(C)过P只能作一条直线与平面平行 (D)过P可作无数条直线与平面平行
(5)( 2x-3 )5 的展开式中x2 项的系数为
(A)-2160 (B)-1080 (C)1080 (D)2160
(6)设函数y = f(x)的反函数为y = f -1(x), 且y = f( 2x-1)的图象过点, 则