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设a,b∈R,则“a>1且b>1”是“ab>1”的( ) A.充分不必要条件 B...
设a,b∈R,则“a>1且b>1”是“ab>1”的( )
A.充分不必要条件
B.必要不充分条件
C.充要条件
D.既不充分也不必要条件
考点分析:
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