计算5x^3y*(-3y)^2+(-6xy)^2*(-xy)-xy^3(-4x)^2
计算3xy[2xy-x(y-2)+x-1]
计算:3xy[2xy-x(y-2)+x]
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2
计算:(5-xy/x^3-x^2y)/(1-5/xy)^2*(y-x)^3
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
x^2-xy-6y^2+3xy+y+2
5xy^2-[3xy^2-(4xy^2-2x^y)]+x^2y-xy^2如何化简
(-3x^y+2xy)-( )=4x^+xy
-3(xy-2x²)-[y²-(5xy-4x²)+2xy]
x+y=8,xy=-2,求(5xy+4x+7y)+(6x-3xy)-(4xy-3y)的值
已知x-y=4xy,则2x+3xy-2yx-2xy-y