x/y=2,求x²-3xy+y²/2x²-3xy+5y²
已知X²-5XY+6Y²=0,求(X²+3XY)\2Y²的值
|x+2y+3|+(2x+y)²=0求x²-xy+y²
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
计算:(1).(-2xy²)*(3x²y)²
已知x/y=3,求x²+2xy-3y²/x²-xy+y³的值
问已知x²+y²=7,xy=-2,求5x²-3xy-4y²-11xy-7x&su
已知3x²+xy-2y²=0.求代数式y分之x-x分之y-xy分之x²+y²的值
已知3x²+xy-2y²=0(x≠0,y≠0),求x/y-y/x-x²+y²/x
已知x-2y=3,x²-2xy+4y²=11,求①xy ②x²y-2xy²
已知(x+2)²+|x+y+5|=0,求3x²y+{-2x²y-[-2xy+(x²