3(X-Y)-5(X-Y)平方-3(X+Y)+(Y-X)平方-4(X+Y)平方+3(Y-X)化简....加油:)

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3(X-Y)-5(X-Y)平方-3(X+Y)+(Y-X)平方-4(X+Y)平方+3(Y-X)化简....加油:)
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3(X-Y)-5(X-Y)平方-3(X+Y)+(Y-X)平方-4(X+Y)平方+3(Y-X)化简....加油:)
3(X-Y)-5(X-Y)平方-3(X+Y)+(Y-X)平方-4(X+Y)平方+3(Y-X)化简...
.加油:)

3(X-Y)-5(X-Y)平方-3(X+Y)+(Y-X)平方-4(X+Y)平方+3(Y-X)化简....加油:)
3(X-Y)-5(X-Y)^2-3(X+Y)+(Y-X)^2-4(X+Y)^2+3(Y-X)
=-4(X-Y)^2-3(X+Y)-4(X+Y)^2
=-8(x^2+y^2)-3(x+y)

3(X-Y)-5(X-Y)平方-3(X+Y)+(Y-X)平方-4(X+Y)平方+3(Y-X)
=3(X-Y)-5(X-Y)平方-3(X+Y)+(X-Y)平方-4(X+Y)平方-3(X-Y)
=-4(X-Y)平方-3(X+Y)-4(X+Y)平方同学同学。。你有没有算错呢。。错没有错,只是没有化简成最简项 以为只是简单的合并同类项噢噢。。。明白了。。谢谢!...

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3(X-Y)-5(X-Y)平方-3(X+Y)+(Y-X)平方-4(X+Y)平方+3(Y-X)
=3(X-Y)-5(X-Y)平方-3(X+Y)+(X-Y)平方-4(X+Y)平方-3(X-Y)
=-4(X-Y)平方-3(X+Y)-4(X+Y)平方

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