计算(x+y)^2-3(x+y)^3+3(y+x)^2-5(y+x)^3拜托求解

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计算(x+y)^2-3(x+y)^3+3(y+x)^2-5(y+x)^3拜托求解
计算(x+y)^2-3(x+y)^3+3(y+x)^2-5(y+x)^3拜托求解

计算(x+y)^2-3(x+y)^3+3(y+x)^2-5(y+x)^3拜托求解
原式=(x+y)^2-3(x+y)^3+3(x+y)^2-5(x+y)^3
=4(x+y)^2-8(x+y)^3
=4(x+y)^2*(1-2x-2y)

(x+y)^2-3(x+y)^3+3(y+x)^2-5(y+x)^3
=(x+y)^2+3(y+x)^2-3(x+y)^3-5(y+x)^3
=4(y+x)^2-8(y+x)^3
=4(y+x)^2(1-2x-2y)

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