计算:合并同类项2(x-y)²-3(x-y)³-(x-y)²+2(x-y)³-6(y-x)²原式=
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计算:合并同类项2(x-y)²-3(x-y)³-(x-y)²+2(x-y)³-6(y-x)²原式=
计算:合并同类项
2(x-y)²-3(x-y)³-(x-y)²+2(x-y)³-6(y-x)²
原式=
计算:合并同类项2(x-y)²-3(x-y)³-(x-y)²+2(x-y)³-6(y-x)²原式=
解
原式
=2(x-y)²-3(x-y)³-(x-y)²+2(x-y)³-6(x-y)²
=(2-1-6)(x-y)²+(2-3)(x-y)³
=-5(x-y)²-(x-y)³
原式=2(x-y)^2-6(x-y)^2-(x-y)^2+2(x-y)^3-3(x-y)^3=-5(x-y)^2-(x-y)^3=(x-y)^2(5-x+y)