去括号:1/2(2X²Y-3XY²+4XY-X²Y²)=?
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
去括号并化简1.4xy²-3x²y-{3x²y+xy²-[2xy²-4
-(-0.5x³-2x²y+1/2xy²)去括号
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
去括号(4x-3y)-[-(3-x)+(x-y)]-5x 还是去括号4xy²-3x²y-{3x
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
( )÷2xy=x²y-2xy²+1括号里应填?
化简并求值 xy-2{xy-[3x²y-(xy²+0.5xy)]+4x²y},其中x=1,
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y