2(X-Y)的平方-7(X-Y)的立方+3(y-x)的平方+(y-x)的立方。怎么化简?
2个回答
展开全部
2(X-Y)的平方-7(X-Y)的立方+3(y-x)的平方+(y-x)的立方
=2(x-y)^2-7(x-y)^3+3(x-y)^2-(x-y)^3
=5(x-y)^2-8(x-y)^3
=2(x-y)^2-7(x-y)^3+3(x-y)^2-(x-y)^3
=5(x-y)^2-8(x-y)^3
追问
看清楚,第二个括号里是y-x,不是x-y
追答
2(X-Y)的平方-7(X-Y)的立方+3(y-x)的平方+(y-x)的立方
=2(x-y)^2-7(x-y)^3+3(x-y)^2-(x-y)^3
=5(x-y)^2-8(x-y)^3
(y-x)的平方=(x-y)的平方
(y-x)的立方=-(x-y)的立方
没错
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