-3(2x²-xy)+4(x²+xy-6)
-3(2x²-xy)+4(x²+xy-6)
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
(1)X²+5X+6 (2)Xy²+2Xy+X
化成最简分式(1)2xy-4/x²y²+3xy-10 (2)2x²+xy-6y²
已知x+xy=-2,xy-y=-6求代数式2x{-4y-3[(x+xy)²+x]-½[(y-xy
已知2x²+xy=6,3y²+2xy=9,求4x²+8xy+9y²的值为( )
-3(xy-2x²)-[y²-(5xy-4x²)+2xy]
1、xy²+2xy-x(因式分解)
化简3/(x²+2xy+y²)-4/(x²-2xy+y²)+5/(x²
求3x²y-2xy²+2(xy-二分之三x²y)-xy+3xy²的值,其中x=3