1/2xy(2/3xy²-2xy)

3xy-3xy-xy+2yx 已知(x+1)²+|y-1|=0,求2(xy-5xy²)-(3xy²-xy)得值 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 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(2x²-xy)+4(x²+xy-6) 因式分解xy²-2xy+x+2y-1 因式分解:-1/3(xy+3)^2+3(3-xy)^2 5x^2y/-1/2xy*3xy^2 y^3+xy^2+2xy+x^2-1 因式分解 1、xy²+2xy-x（因式分解）