计算:-2xy^2÷(-4y/3x)^2

计算（xy-y^2)÷x-y/xy 计算:4xy-(x+y)^2/xy(x+y)(x-y)÷x^2+xy-2y^2/x^2y+2xy^2 计算3xy[2xy-x(y-2)+x-1] 计算：3xy[2xy-x（y-2）+x] 计算：(x+y/x-y)÷(xy+x^2) 计算(3x^3y-x^2y+1/2xy)÷(-1/2xy） 计算 2xy[4x²y²-3y（xy+x²y）-xy²] （x^2+xy/x-y)/（xy/x-y)计算 计算(3y分之2x)×(4y分之3x)÷(4分之1xy) x-y/xy-y^2计算 计算 (-4/3xy)(-3x^2y)^2=( ) 计算：（-3xy)^3*(-4/3x^2y)