(-x-y)______=x2+2xy+y2.-数学

题目简介

(-x-y)______=x2+2xy+y2.-数学

题目详情

(-x-y)______=x2+2xy+y2
题型:填空题难度:中档来源:不详

答案

∵(x+y)2=x2+2xy+y2,
而-x-y=-(x+y),
∴[-(x+y][-(x+y)]=x2+2xy+y2,
即(-x-y)(-x-y)=x2+2xy+y2.
故答案为-x-y.

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