[(x+3y)(x-3y)-(x-3y)²]÷6y
1.((y+2x)(-2x+y)+4(x+2y)^2)/3y 2.(2(x-y)^3-8(x-y)^2(x+y)+6y(
计算:(x-y)^7÷(y-x)^6+(-x-y)^3÷(x+y)^2
化简 3(X-Y)²-4(X-Y)+7(X-Y)-6(X-Y)²
[x(x²y²-xy)-y(x²-x³y)]÷3x²y
因式分解:[x(x²y²-xy)-y(x²-x³y)]÷3x²y
先化简,在求值:(x-y)²+(3x-2y)(2x+y)-x(6x-y)
已知x-y=1,y≠0,求{(x+2y)²+(2x+y)(x+4y)-3(x+y)(x-y)}÷y的值.
计算:(x+2y)(3x-5y)-(6x的四次方y²-2x²y²)÷(2x²y&
急![(3x+y)²-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy)
化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)
因式分解 (1)6(x-y)^3-3y(y-x)^2 (2)x(x-y)(a-b)-y(y-x)(
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=