计算:(4xy(x-y)^-1+(x(y^-1)-(x^-1)y)/((x^-1)+(y^-1)))*(x+y)^-2

计算下面式子{x-y+[(4xy)/(x-y)]}{x-y-[(4xy)/(x-y)]} 化简计算:[x-y+4xy/(x-y)] * [x+y-4xy/(x+y)] 计算:[x-y+4xy/(x-y)] * [x+y-4xy/(x+y)] 计算：（x-y+4xy/x-y)(x+y-4xy/x+y) (x-y+(4xy/x-y))(x+y-(4xy/x+y)) 分式计算 计算:2xy/(x+y)².(x+y)/4y 计算:(4xy(x-y)^-1+(x(y^-1)-(x^-1)y)/((x^-1)+(y^-1)))*(x+y)^-2 计算：(xy-x²)×x-y/xy 计算:(x-2y)(1+x+2y+4y^2+2xy+x^2) 计算3xy[2xy-x(y-2)+x-1] 计算(3x-4y)-(3x+4y)-xy 计算：[(x-y)^2-(x+y)^2]/(-4xy)= 计算：（1）8x^2y^2*(-3x/4y^5) (2)(x+y)^2/xy-y^2*(y-x)^2/xy+y^2 计算x²-x/x²×x/1-x和x²-4y²/x²+2xy+y²÷x+2y/x²+xy xy[（x^-1)+(y^-1)] 计算 （x^2+xy/x-y)/（xy/x-y)计算 计算1-(x-2y/x+2y)/(x^2-y^2/4xy-x^2-4y^2) 计算：(1)x^2-4y^2/x^2+2xy+y^2除以x+2y/x^2+xy(2)x+2y/x^2-y^2+y/y^2-x^2-2x/x^2-y^2