3(xy-xy)-2(xy+xy)+3xy
3(xy-xy)-2(xy+xy)+3xy
3xy-3xy-xy+2yx
已知 (x+1)² +|y-1|=0,求 2(xy-xy²)-(3xy²-xy) 的值.
xy^3-xy 进行因式分解
xy-3xy+2yx-yx
化简:xy分之3x^2+2xy-xy分之2x^2-xy=
x+y=3Xy,求X+y+2Xy分之2X+2y-Xy的值是多少?
已知x+y=3 xy=-2 求代数式 (3xy+10y)+[5x-(2xy+2y-3x)]的值
先化简,再求值 ⒈2(Xy+Xy)-3(Xy-xy)-4Xy,其中X=1,y=-1
xy-xy分之2xy-y和x-4分之4-4x+x求化简
(x+2y-3xy)-(-2x-y+xy),其中x+y=,xy=-,求值.
已知x=3 y=1\3,求3x²y-[2xy²-2﹙xy-3\2x²y﹚+xy]+3xy&