化简 (x^2-2xy+y^2-1)/(x-y-1)
化简!1、(x^2-xy)+xy+y^2 2、3(x^2-xy)-xy+y^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-2xy)(x+y-2)+(1-xy)²
化简 (x+y)(x²-xy+y²) ; 3(2x-1)(x+6)-5(x-3)(x+6)
x根号x+x根号y/xy-y^2)-(x+根号xy+y/x根号x-y根号)y
(1)3xy×(-4xy+2xy-1)(2)(x+2y)(3x-2y)+(x-2y)(3x+2y)
(1)x-y/x-2y÷x^2-y^2/x^2-4xy+4y^2
(1)正数x,y满足x^2-y^2=2xy,求(x-y)/(x+y)
(1) -3X^-2XY-8XY-(-5Y^2)-2X^2-Y^2
分解因式:(X+Y-2XY)*(X+Y-2)+(1-XY)∧2
计算(3x^3y-x^2y+1/2xy)÷(-1/2xy)