3(x-y)²+4(x-y)³

计算 [12(x+y)³(y-x)]³÷[4(x+y)²（x-y)]² 化简 3(X-Y)²-4(X-Y)+7(X-Y)-6(X-Y)² 因式分解：(x-y)(3x-7y)²-4(x-y)(x+y)² 3(x-y)²×[-4/15(y-x)³][-3/2(x-y)∧4] (x-y)³+9(x-y)-6(x-y)² (x-y)³(x-y)²(y-x)等于多少 (2x-y)²-4(x-y)(x+2y) 化简：（2x-y)²-4(x-y)(x+y) [x（x²y²-xy）-y（x²-x³y）]÷3x²y 【x(x²y²-xy)-y(x²-x³y)】÷3x²y 因式分解：[x（x²y²-xy）-y（x²-x³y）]÷3x²y (3x-y)²-2x（4x-5y）-（x+2y）²