-3x²y+2x²y+3xy²-2xy²,其中x=1,y=-1
化简求值3x²y-[2xy-2(xy-3/2x²y)+xy]+3xy²其中x=3、y=-1
化简并求值 xy-2{xy-[3x²y-(xy²+0.5xy)]+4x²y},其中x=1,
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=-
若x=1/2,y=1 求x(x²+xy+y²)-y(x²+xy+y²)+3xy(
2xy-1/2(4xy-8x²y²)+2(3xy-5x²y²),其中x=3/2,
(x+2y-3xy)-(-2x-y+xy),其中x+y=1/2,xy=-1/2
1/x+1/y=5,求2x-3xy+2y/x²+xy+y的值
化简求值3x[xy-2x(y-2x)]+3y(x²-y²),其中x=-1,y=2
3xy²-[xy-2(xy-3/2x²y)+3xy²]+3xy²,其中x=3,y
化简求值:3(2X²Y-3XY²)-2(2XY²-3X²Y),其中X=1,Y=-