计算（xy-y^2)÷x-y/xy

计算（xy-y^2)÷x-y/xy （x^2+xy/x-y)/（xy/x-y)计算 计算：(x+y/x-y)÷(xy+x^2) 计算:4xy-(x+y)^2/xy(x+y)(x-y)÷x^2+xy-2y^2/x^2y+2xy^2 x-y/xy-y^2计算 计算：(xy-x²)×x-y/xy 计算：x²+2xy+y²/xy-y².x²-2xy+y²/xy+y&# 计算；（xy-x²）÷x²-2xy+y²/xy · x-y/x² 计算3xy[2xy-x(y-2)+x-1] 计算：3xy[2xy-x（y-2）+x] 计算(3x^3y-x^2y+1/2xy)÷(-1/2xy） 计算xy-y²分之x²+2xy+y²÷x²-2xy+y²分之xy+y&