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
(8﹣x2y+7xy2﹣6xy)﹣[8xy﹣(x2y+y2x)]
解:原式=8﹣x2y+7xy2﹣6xy﹣8xy+x2y+y2x,
=(﹣x2y+x2y)+(7xy2+y2x)+(﹣6xy﹣8xy)+8,
=8xy2﹣14xy+8