y厂x+x厂y/xy-y2-x+厂xy+y/x厂x-y厂y 化简

y厂x+x厂y/xy-y2-x+厂xy+y/x厂x-y厂y 化简 (x-y)(x2+xy+y2) (x+y)(x2-xy+y2) (x-y)(x2+xy+y2)-xy(y-x) 因式分解x2+y2-xy-x-y+1 x2-4y2-3xy+y+x |x|/x+y/|y|+xy/|xy|= 因式分解x^3y-2x^2y2+xy^3 1*{x+y+xy=7{x2+y2+xy=132*{x2+y2=10{x+xy+y=7 x2+y2 xy+x+y-1x y属于R 比较大小 x2+y2 xy+x+y-1 已知x.y满足X2-y2=2xy.则x-y/x+y=?x. 计算(x+y/x-y + 4xy/y2-x2)(x2-9y2)/（x2+2xy-3y2） 【x(xy-xy)-y(x-xy)】÷3xy 已知x2-y2=xy（xy不等于0）则x/y-y/x=____ 求分解因式 (x+y)(x2-xy+y2)-xy(x+y) 若x-y/x+y=2,则x2+2xy+y2/4xy=多少 -x-3xy+y xy-1+x-y