先化简,再求值 4（xy²＋3xy-2x²y)-[12xy-3(3x²y-2xy²

先化简,再求值 4（xy²＋3xy-2x²y)-[12xy-3(3x²y-2xy² 先化简,再求值:{xy(x²-3y)+3xy²}(-2xy)+x³y²(2x-y 先化简,再求值 ⒈2(Xy+Xy)-3(Xy-xy)-4Xy,其中X=1,y=-1 化简并求值 xy-2{xy-[3x²y-(xy²+0.5xy)]+4x²y},其中x=1, 化简求值3x²y-[2xy-2（xy-3/2x²y)+xy]+3xy²其中x=3、y=-1 化简求值3x²y-[2xy²-2(xy-3/2x²y)+xy]+3xy² ,当x -3(xy-2x²)-[y²-(5xy-4x²)+2xy] 先化简在求值：(-1/3XY)²×[xy(2x-y)-2x(xy-y)²],其中X=-3/2,Y=2 先化简在求值：(-1/3XY)²×[xy(2x-y)-2x(xy-y)²],其中X=-3/2,Y=- 先化简,再求值：3xy²(-x²y+2x³y²)-4xy(-xy²)· 化简求值 已知：（x+2）2;+|y+1|=0求5xy²-｛2xy²-[3xy²（4xy& 化简求值：【4（xy-1）²-(xy+2)(2-xy)】÷¼xy,其中x=-3,y=1/5