2016-11-08 21:28发布
若-4xy^2n与3x^my^6是同类项，则m-n的值为（ ）
A.-2 B.2 C.-4 D.4
m=1
2n=6, n=3
m-n=1-3=-2
答案是:A. -2
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m=1
2n=6, n=3
m-n=1-3=-2
答案是:A. -2
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