有下列说法: (1)a>b>0是a 2 >b 2 的充要条件; (2)a>b>0是 1 a < 1 b 的充要条件; (3)a>b>0是a 3 >b 3 的充要条件. 则其中正确的说法有( )
A.
0个
B.
1 个
C.
2 个
D.
3 个
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举一反三
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