(3xy^2)^2+(-xy^3)(4xy)
3xy-3xy-xy+2yx
先化简,再求值 ⒈2(Xy+Xy)-3(Xy-xy)-4Xy,其中X=1,y=-1
3(xy-xy)-2(xy+xy)+3xy
xy-3xy+2yx-yx
-3(2x^2-xy)+4(x^2+xy-6)
(-3x^y+2xy)-( )=4x^+xy
-3(2x²-xy)+4(x²+xy-6)
5xy^2-[3xy^2-(4xy^2-2x^y)]+x^2y-xy^2如何化简
化简:xy分之3x^2+2xy-xy分之2x^2-xy=
x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2
已知x-y=4xy,则2x+3xy-2yx-2xy-y
-3(xy-2x²)-[y²-(5xy-4x²)+2xy]