4X^2 Y^2+2XY-X^2-Y^2可因式分解为何?请帮我- -

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) (-x-y)(x^2+xy+y^2) 计算:2xy/(x+y)².(x+y)/4y 化简x^-y^/x^-2xy+y^ 2*(x-y)²(y-x)(xy) （x^2+xy/x-y)/（xy/x-y)计算 (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) X-Y/2X+2Y XY/X+Y² 因式分解：x×x-xy-2y×y-x-y 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 (x-y)[(x+y)^2-xy]+(x-y)[(x-y)^2+xy]