3xy^2*(-2xy)

3xy-3xy-xy+2yx 3(xy－xy)－2(xy＋xy)＋3xy xy-3xy+2yx-yx 化简:xy分之3x^2+2xy-xy分之2x^2-xy= 先化简,再求值 ⒈2(Xy+Xy)-3(Xy-xy)-4Xy,其中X=1,y=-1 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 因式分解:-1/3(xy+3)^2+3(3-xy)^2 x^2-xy-6y^2+3xy+y+2 5x^2y/-1/2xy*3xy^2 -3(2x^2-xy)+4(x^2+xy-6) y^3+xy^2+2xy+x^2-1 因式分解 2(x平方-xy)-3(2x平方-3xy)