4x^2-8xy+4y^2/2x-2y 约分

因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y) 化简：3x^2-[5xy-(x^y-3xy)+4x^2y-8xy] (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 诺x+y=6,xy=4 求(5x-4y-3xy)-(8x-y+2xy) 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) 计算(x^8-x^7y+x^5y^3-x^4y^4+x^3y^5-x^y^7+y^8)(x^2+xy+y^2) 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? 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 计算：（1）8x^2y^2*(-3x/4y^5) (2)(x+y)^2/xy-y^2*(y-x)^2/xy+y^2 因式分解：x-4xy-2xy+8y等于? [(X-2Y)^2-X(X-4Y)-8XY]÷4Y （-3x^y+2xy)-( )=4x^+xy