(x²+1/2xy+1/2y²)-(x²+2/3xy-2y²),其中x=-1/4
2xy-1/2(4xy-8x²y²)+2(3xy-5x²y²),其中x=3/2,
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
合并同类项并计算 -3[y-(3x²-3xy)]-[y+2(4x²-4xy)]其中,x=3,y=1/
(x²+1/2xy+1/2y²)-(x²+2/3xy-2y²),其中x=-1/4
化简求值:3(2X²Y-3XY²)-2(2XY²-3X²Y),其中X=1,Y=-
先化简再求值(3x²y-xy²)-3(x²y-2xy²)其中x=1/2,y=1/
先化简,再求值:3x²—[2x²y—(xy—x²)]+4x²y,其中x=—1,y
化简求值:【4(xy-1)²-(xy+2)(2-xy)】÷¼xy,其中x=-3,y=1/5
化简求值:(-1/3XY)²[xy(2x-y)-2x(xy-y²)],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=2
先化简在求值:(-1/3XY)²×[xy(2x-y)-2x(xy-y)²],其中X=-3/2,Y=-