化简xy-1-x+y

化简xy-1-x+y xy-1+x-y 化简!1、（x^2-xy）+xy+y^2 2、3（x^2-xy）-xy+y^2 化简4xy-y-xy+x (xy+1)(x+1)(y+1)+xy (xy+1)(x+1)(y+1)+xy (xy+1)(x+1)(y+1)+xy 化简:[4xy(x-y)^-1 + (xy^-1 - x^-1y)/(x^-1 + y^-1)] / (x+y)^2 化简x^-y^/x^-2xy+y^ .(x+y-2)(x+y-2xy)+(xy-1)^2 分解因式(xy+1)(x+y+xy+1)+xy 因式分解xy-x-y+1 xy+x+y+1因式分解 1-x-y+xy 因式分解 因式分解:xy+x+y+1 xy-1+x-y因式分解 xy-x-y+1因式分解 钻机XY-1 ,X,Y,