计算[2(x-y)^2+8xy]/(x+y)+1

Question

计算[2(x-y)^2+8xy]/(x+y)+1

Answer 1

你好：

[2(x-y)^2+8xy]/(x+y)+1
=（2x²-4xy+2y²+8xy）/(x+y)+1
=2(x²+2xy+y²)/(x+y)+1
=2(x+y)²/(x+y)+1
=2x+2y+1

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