(-3xy^2)^2+(-4xy^3)*(-xy)=多少
3xy-3xy-xy+2yx
先化简,再求值 ⒈2(Xy+Xy)-3(Xy-xy)-4Xy,其中X=1,y=-1
由已知x+y=-2,xy=3那么2(x+xy)-[(xy-3y)-x]-(-xy)等于多少?
化简:xy分之3x^2+2xy-xy分之2x^2-xy=
(-3x^y+2xy)-( )=4x^+xy
3(xy-xy)-2(xy+xy)+3xy
已知x-y=4xy,则2x+3xy-2yx-2xy-y
xy-3xy+2yx-yx
若x+y分之xy=2,则-x+3xy-y分之3x-xy+3y=多少?
当x=3,y=3分之1时,求代数出3xy-[2xy-2(xy-2分之3xy)+xy]+3xy的值
-3(2x^2-xy)+4(x^2+xy-6)
-3(2x²-xy)+4(x²+xy-6)