(x+y-2xy)(x+y-2)+(1-xy)^2
分解因式:(X+Y)*(X+Y+2XY)+(XY+1)*(XY-1)
xy(xy+1)+(xy+3)-2(x+y+2分之一)-(x+y-1)的平方
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
化简!1、(x^2-xy)+xy+y^2 2、3(x^2-xy)-xy+y^2
计算:3xy[2xy-x(y-2)+x]
x根号x+x根号y/xy-y^2)-(x+根号xy+y/x根号x-y根号)y
分解因式:(X+Y-2XY)*(X+Y-2)+(1-XY)∧2
(1) -3X^-2XY-8XY-(-5Y^2)-2X^2-Y^2
(xy-1)平方+(x+y-2xy)(x+y-2)因式分解
分解因式:(xy-1)的平方+(x+y-2)(x+y-2xy).
计算(3x^3y-x^2y+1/2xy)÷(-1/2xy)
分解因式(xy-1)^2+(x+y-2)(x+y-2xy)