E偶数啊 除以19都是偶数,那把19乘上去还是偶数.
但是正负是不能判断的,因为偶数也有正负之分,这里没说 -M/19是正是负,那就不知道了
[GRE数学]If -m/19 is an even integer,which of the following mu
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