问题 解答题

(8﹣x2y+7xy2﹣6xy)﹣[8xy﹣(x2y+y2x)]

答案

解:原式=8﹣x2y+7xy2﹣6xy﹣8xy+x2y+y2x,

=(﹣x2y+x2y)+(7xy2+y2x)+(﹣6xy﹣8xy)+8,

=8xy2﹣14xy+8

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