(1)下列元素的全體不能組成集合的是
(A)大于3小于11的偶數(shù) (B)我國的小河流
(C)方程的所有實數(shù)根(D)亞洲國家的首都
(2)設集合A={1,2,3,4,5},B={2,4,6}則 =
(A){6}(B){2,4}(C){2}(D){1,2,3,4,5,6}
(3)設U={x|x是小于8的正整數(shù)},A={1,2,3}則
(A){1,2,3,4}(B){4,5,6,7}(C){3,5,6,7}(D){3,5,6,8}
(4)已知集合A={x|}下列表示中錯誤的是
(A)1(B){1}(C){2}¢(D){1,-1}
(5)函數(shù)的定義域是
(A)()(B)[-1,(C)[0,(D)(-1,
(6)下列函數(shù)中與函數(shù)y=x是同一函數(shù)的是
(A)(B)(C)(D)