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这里方程应该是(X-5)(X+7)。但是没有说m和n一定为正或者负,个人认为应该有两组可能解:
1. m=5,n=-7, 此时A>B
2. M=-7,N=-5, (X-M)(X+N)也可成立,此时B>A
所以我选了D,为什么选B呢
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