16y²-16xy²+4x²y²/﹣2x²y+12xy-16y 约分求
约分:2x²y-2xy²/x²-2xy+y²
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y
分式约分:x²-4y²/x²+2xy+y²
约分:x²+y²-9-2xy/x²-y²+6x+9
已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y²
计算:(xy-x²)×x-y/xy
x²/xy-x/y
1.x-y=16,xy=6,求3x²y-6xy²+18y+6
2x²y+{2xy-[x²y-2(﹣3x²y+xy)]﹣4xy²} 计算
因式分解 -4xy+x²y+4y
2x+y=0,求4x²+2xy(x+y)+y³
4/X+1/Y=2,XY=-1,求代数式4Y-X/X-2Y/(x+2y-12Y²/x-2y)的值