-4/9x²+4/3xy+y²
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
(2x²y-3xy²)-3(x²y-2xy²)+2(x²y-4xy
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y
-3(xy-2x²)-[y²-(5xy-4x²)+2xy]
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
化简4xy-3y²-3x²+xy-3xy-2x²+x²-2y²
-4x²y-8xy²+2x²y-3xy²
因式分解:4x²y+4xy²+xy²
已知2x²+xy=6,3y²+2xy=9,求4x²+8xy+9y²的值为( )
已知2x²+xy=a,3y²-2xy=b,求4x²+8xy-9y²的值(用含a,
已知2x²+xy=10,3y²+2xy=6,求4x²+8xy+9y²的值
已知2x²+xy=a,3y²+2xy=b,求4x²+8xy+9y²的值(用a,b