去括号并化简1.4xy²-3x²y-{3x²y+xy²-[2xy²-4
去括号并化简1.4xy²-3x²y-{3x²y+xy²-[2xy²-4
化简并求值 xy-2{xy-[3x²y-(xy²+0.5xy)]+4x²y},其中x=1,
去括号:1/2(2X²Y-3XY²+4XY-X²Y²)=?
先去括号,再合并同类项:3x²y-[2xy²-2(xy-2/3x²y)+xy]+3xy
代数式去括号并合拼同类项“3x²y+xy²-【2xy²-4x²+(x²
-3(xy-2x²)-[y²-(5xy-4x²)+2xy]
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
化简求值3x²y-[2xy-2(xy-3/2x²y)+xy]+3xy²其中x=3、y=-1
(2x²y-3xy²)-3(x²y-2xy²)+2(x²y-4xy
计算:(xy-x²)×x-y/xy
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
化简求值3x²y-[2xy²-2(xy-3/2x²y)+xy]+3xy² ,当x