4x^2-4xy-3y^2-4x+10y-3用十字相乘法,求解 步骤越详细越好要 写得能看得懂

因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y) 因式分解 x-xy+3y-3x 2x+xy-y-4x+5y-6 化简：3x^2-[5xy-(x^y-3xy)+4x^2y-8xy] 化简2(x²y+xy)-3(x²y-xy)-4x²y （-3x^y+2xy)-( )=4x^+xy 约分：（1）-4x^2y^3/10xy^4(2)（x^2-4xy+4y^2)(y-x)/(2y-x)(x^2-y^2) x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x² (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 x²-y²+5x+3y+4（x+y-2xy)(x+y-z)+(xy-1）² x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2 5x^3y*(-3y)^2+(-6xy)^2*(-xy)+xy^3*(-4x^2) 已知x+y=-2,求代数式(6xy+10y)+[4x-2(3xy+2y-x)] 当x-y=2xy时,求4x-3xy-4y/xy XY(XY+3)+(XY+4)+4(X+Y+1)-(X+Y+2) x^2-4xy+3y^2=（x-3y)(x-y)x^2-4xy+3y^2 怎么分解成（x-3y)(x-y) 3(x^2y+xy)-4(xy-2x^2y)-(-xy) 3（x平方y+xy)-4(xy-2x平方y)-(xy)