3y/2x+2y＋2xy/x²+xy 2x/x²-64y²－1/x-8y (1/a+1/b)²÷(1/a²-1/b²) (3x&su3y/2x+2y＋2xy/x²+xy 2x/x²-64y²－1/x-8y (1/a+1/b)²÷(1/a²-1/b²) (3x²/4y)²×2y/3x+x²/2y²÷2y²/

若x²+xy-2y²=0,则x²+3xy+y²/x²+y² x²+xy-2y²=0则x²+3xy+y²/x²+y² 计算：4xy²-3x²y-{3x²y-[2xy²-4x²y+2(x²y-2xy²)]急 x²-2xy+y²-9 x/y=2,求x²-3xy+y²/2x²-3xy+5y² 已知x/y=3,求x²+2xy-3y²/x²-2xy+y² 已知x/y=3,求x²+2xy-3y²/x²-xy+y²的值 x/y=2,求分式x²-xy+3y²/x²+xy+6y² 因式分解X²-3Xy+2y²+X-2 因式分解 x²-3xy+2y²+x-2 已知X+Y=12,XY=9.求（X²+3XY+2Y²）÷（X²Y＋2XY²） 已知x² -XY = 2,Y² -XY= 5,求x² - 4x Y+ Y² = 2x² + xY -3Y² = x² 已知x² -XY = 2,Y² -XY= 5,求x² - 4x Y+ Y² = 2x² + xY -3Y² = x² + xY- 2Y² =求x² - 4x Y+ Y² = 已知：x²+xy=3,xy+y²=-2 求：2x²-xy-3y² 因式分解 x²-XY-2y²-X-Y x²+xy-2y²-x+7y-6 6x²-xy-15y²=0 求x²-2xy+4y²/2x²-3xy-3y²告诉下 6x²-xy-15y²=0 求2x²-3xy-3y²分之x²-2xy+4y² 因式分解2x(x-y)^4 - x²(x-y)² + xy(y-x)²RT