4x^2y·(-xy^2)/x^2y^4得多少?最好有过程,谢谢了~~(3x+2)(x-3)-3(x-2)^2得多少？

因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y) (x+y)(x+y+2xy)+(xy+1)(xy-1)(x+y)(x-y)+4(y-1) 计算:2xy/(x+y)².(x+y)/4y (x^-4y^)/(x^+2xy+y^)/(x+2y)/(2x^+2xy) 因式分解 x-xy+3y-3x 2x+xy-y-4x+5y-6 2x(x-y)+4xy(y-x) 因式分解2x(x-y)+4xy(y-x) 因式分解 (x^2+2xy+y^2-4xy)*(x^2-2xy+y^2+4xy) 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? 化简：3x^2-[5xy-(x^y-3xy)+4x^2y-8xy] 因式分解x^2(x-y)-4xy(x-y)-4y^2(y-x) 计算:4xy-(x+y)^2/xy(x+y)(x-y)÷x^2+xy-2y^2/x^2y+2xy^2 化简2(x²y+xy)-3(x²y-xy)-4x²y （-3x^y+2xy)-( )=4x^+xy 因式分解2x(x-y)^4 - x²(x-y)² + xy(y-x)²RT x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x² (-x-2y)(x²-2xy+4y²) -2x³y+4x²y-2xy 计算：[(x-y)^2-(x+y)^2]/(-4xy)=