计算:【-6(x+y)²(x—y)³】÷【3(x+y)(x—y)²】²
计算:(x+2y)(3x-5y)-(6x的四次方y²-2x²y²)÷(2x²y&
计算 [12(x+y)³(y-x)]³÷[4(x+y)²(x-y)]²
计算4(x+y)^5(x-y)^4÷[2(x+y)³*(y-x)²]
(x-y)³(y-x)(y-x)²+(x-y)^6
[x(x²y²-xy)-y(x²-x³y)]÷3x²y
因式分解:[x(x²y²-xy)-y(x²-x³y)]÷3x²y
2.(x+y)²(x-y)²-(x-y)(x+y)(x²+y²)
计算:(x-y)的5次方(x-y)²(x-y)³
先化简再求值 :[(x+2y)²-(x+y)(3x-y)-5y²]÷(2x),其中x=—2,y=5
求因式分解(x-y)²-2(x-y)³和(x+y)(x-y)-x(x-y)
计算3x/8y×16y²/27x² (2xy-x²)÷x-2y/xy 2x-6/x
(x-y)³+9(x-y)-6(x-y)²