已知a,b,c都是实数，那么p：“ac＞bc”是q：“a＞b”的（）A.充分不

已知a,b,c都是实数，那么p：“ac＞bc”是q：“a＞b”的（　　）

A.充分不必要条件

B.必要不充分条件

C.充要条件

D.既不充分又不必要条件

答案

解析：

q,如c＜0时;q

p,如c=0时,故选D.

答案：

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已知a,b,c都是实数，那么p：“ac＞bc”是q：“a＞b”的（ ）A.充分不

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已知a,b,c都是实数，那么p：“ac＞bc”是q：“a＞b”的（）A.充分不