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标题: gwd9 [打印本页]

作者: leadership    时间: 2005-6-21 06:27     标题: gwd9

is n an odd integer?

1) n is divisible by 3

2) 2n is divisible by twice as many positive integers as n

the key is B.

用举例法, n=3 2n=6 则n是奇数。 n=6 2n=12 n 有4个因子,而12有8个因子,则n为偶数。

即使加上条件一,仍然不能推出,难道不应该是e么?






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