12x^2-10xy+2y^2+11x-5y+2 有谁告诉我可以怎么做啊~~~~~越快越好!

因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y) （x^2+xy/x-y)/（xy/x-y)计算 (-x-y)(x^2+xy+y^2) 化简x^-y^/x^-2xy+y^ 2*(x-y)²(y-x)(xy) x^2-xy/xy-y^2约分 .(x+y-2)(x+y-2xy)+(xy-1)^2 (x^2-xy)y÷y-x/xy怎么做? 求解12x²-10xy+2y²+11x-5y+2=0 代数 x^-y^/ x^-(y-z)^ 除以 x^+2xy+y^/(x-y)^-z^ 乘 x^+xy-xz/x^-xy (x+y)/x /(x-(2xy-y^2)/x) 因式分解 (xy-x²)÷(x²-2xy+y²/xy)×（x-y/x²） x-y/x²÷x²-2xy+y²/xy*（xy-x²） 已知xy-x-y=11,求(xy-1)^2+(x+y-2)(x+y-2xy)的值. X-Y/2X+2Y XY/X+Y² 已知x-xy=10,xy-y=2,则x-y=（ ）,-2xy+x+y=（ ）. 已知x-xy =21,xy-y=-12,分别求式子x-y与x-2xy +y 已知x-xy=20,xy-y=12,则x-y= ,-2xy+x+y=