2x²y+4x²y-3xy²-5xy²,其中x=1,y=-1
x²+xy/(x-4y)(x+y),其中x=4,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,
2xy-1/2(4xy-8x²y²)+2(3xy-5x²y²),其中x=3/2,
x三次方-3x²y+3xy²+4x²y-xy²+y的三次方,其中x=-1,y=-
求3xy²-4x²y-2xy²+ 5x²y的值,其中x,y满足|x-1|+(y+
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=-
1/x+1/y=5,求2x-3xy+2y/x²+xy+y的值
初一数学先化简再求值:4x²y-[6xy-3(4xy-2)-x²y]+1,其中x=2,y=-1/2
合并同类项并计算 -3[y-(3x²-3xy)]-[y+2(4x²-4xy)]其中,x=3,y=1/