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已知x²y的值是2,则(5x²y+5xy-7x)-(4x²y+5xy-7x)的值为 A.二分之一 B.-2 C.2 D.4
人气：291 ℃　时间：2020-05-18 12:10:48
解答
(5x²y+5xy-7x)-(4x²y+5xy-7x)
=5x²y+5xy-7x-4x²y-5xy+7x
=x²y
=2
选C
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