3x^2y-[2xy-2(xy-2/3x^2y)+xy],其中x=3,y=-3/1.等于
(x+2y-3y)- (-2x-y+xy ) 其中x+y=0.5 xy等于-0.5
由已知x+y=-2,xy=3那么2(x+xy)-[(xy-3y)-x]-(-xy)等于多少?
(x+2y-3xy)-(-2x-y+xy),其中x+y=1/2,xy=-1/2
(x+2y-3xy)-(-2x-y+xy),其中x+y=,xy=-,求值.
3x^2y-[2xy-2(xy-2/3x^2y)+xy],其中x=3,y=-3/1.等于
先化简,再求值 ⒈2(Xy+Xy)-3(Xy-xy)-4Xy,其中X=1,y=-1
(-3x^y+2xy)-( )=4x^+xy
(x+2y-3xy+2x+y-xy)-(-2-y+xy),其中x+y=2分之1,xy=-2分之1
已知x-y=4xy,则2x+3xy-2yx-2xy-y
已知x-y的绝对值等于4,xy=-3,xy^2+x^2y=?
3x^2y-[2xy^2-4(1/2xy-3/4x^2y)+xy]+3xy^2,其中x=3,y=-1/3
化简求值3x²y-[2xy-2(xy-3/2x²y)+xy]+3xy²其中x=3、y=-1