计算[4xy(x-y)^-1+(xy^-1-x^-1y)除以(x^-1+y^-1)]乘以（x+y）^-2

计算3xy[2xy-x(y-2)+x-1] 计算：(xy-x²)×x-y/xy xy[（x^-1)+(y^-1)] 计算 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：5xy^2-[3xy^2-(4xy^2-2x^2y)]+2x^2y-xy^2 计算2(-x^4 y)²×(-1/4xy³) (-1/2x^3-3/2xy+1/4y^2)(-2xy^2)^2计算 计算（3x^2y-xy^2+1/2xy）/（-1/2xy） 计算xy^2(-xy)^2-3/2xy^3*4/3x^2y 计算（-3分之1xy²）²×[xy（2x-y）+xy²]= （x^2+xy/x-y)/（xy/x-y)计算 计算:2xy/(x+y)².(x+y)/4y 计算:4xy-(x+y)^2/xy(x+y)(x-y)÷x^2+xy-2y^2/x^2y+2xy^2 计算：( 根号xy-xy/x+根号xy)÷根号xy-y/x-y=