计算[(2x^2y)^2(-2xy)^3-xy^2(-4xy^2)^2]除8x^2y^3

计算3xy[2xy-x(y-2)+x-1] 计算：3xy[2xy-x（y-2）+x] （x^2+xy/x-y)/（xy/x-y)计算 计算 2xy[4x²y²-3y（xy+x²y）-xy²] （-3x^y+2xy)-( )=4x^+xy （xy-x^2)乘以(xy)/(x-y) (x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y) 计算（xy-y^2)÷x-y/xy x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2 已知x-y=4xy，则2x+3xy-2yx-2xy-y x-y/xy-y^2计算 x^2-xy-6y^2+3xy+y+2