5x^2y-3xy^2+4xy-14xy^2+4xy-2x^2y(化简)
x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^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]
已知x-y=4xy,则2x+3xy-2yx-2xy-y
先化简,再求值 ⒈2(Xy+Xy)-3(Xy-xy)-4Xy,其中X=1,y=-1
(xy-x^2)乘以(xy)/(x-y)
3(x的2次方y+xy)-4(xy-2x的2次方y)-(-xy)化简
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
化简!1、(x^2-xy)+xy+y^2 2、3(x^2-xy)-xy+y^2
计算:3xy[2xy-x(y-2)+x]
计算 2xy[4x²y²-3y(xy+x²y)-xy²]