数学题x^2-2xy+y^2-x+y-2因式分解,

一道数学题(3x^2y-4xy^2)/xy 数学题(x+y+3)(x^2+y^2+2xy-3x-3y+9) 求解一道数学题；（xy-1)^2+(x+y-2)(x+y-2xy) 分解因式 求解一道数学题；（xy-1)^2+(x+y+2)(x+y+2xy) 分解因式 (-x-y)(x^2+xy+y^2) 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-Y/2X+2Y XY/X+Y² 因式分解：x×x-xy-2y×y-x-y 求一道数学题答案5x^2-10xy+5y^2-2x+2y 数学题x^2-2xy+y^2-x+y-2因式分解, 问几个数学题 当x/y=2时 x^2-y^2/xy等于多少 问道SAT数学题：xy=x+y.如果y>2,求x的范围? 因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y) (x-y)[(x+y)^2-xy]+(x-y)[(x-y)^2+xy] 一道数学题,(x-y)^3×(x-y)^2×(y-x) .(x+y-2)(x+y-2xy)+(xy-1)^2