计算：2x^3y*[(3xy^2)^2)+(-4xy^3)*(-xy)] (ab^2)^3*(ab^2)^2 (2x+5

计算3xy[2xy-x(y-2)+x-1] 计算：3xy[2xy-x（y-2）+x] x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2 （-3x^y+2xy)-( )=4x^+xy 1.x-z/xy - 2ab/xy 5xy^2-[3xy^2-(4xy^2-2x^y)]+x^2y-xy^2如何化简 计算：(5-xy/x^3-x^2y)/(1-5/xy)^2*(y-x)^3 -3(xy-2x²)-[y²-(5xy-4x²)+2xy] 计算 2xy[4x²y²-3y（xy+x²y）-xy²] (x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y) 先化简,再求值 ⒈2(Xy+Xy)-3(Xy-xy)-4Xy,其中X=1,y=-1 已知x-y=4xy，则2x+3xy-2yx-2xy-y