分式乘除法:已知x-3y=0,求2x+y/x²-2xy+y²×(x-y)的值
分式乘除法:已知x-3y=0,求2x+y/x²-2xy+y²×(x-y)的值
已知x/y=3,求x²+2xy-3y²/x²-xy+y²的值
分式的乘除法计算::x²-4y²/x²+2xy+y²÷x+2y/x²+
已知X²-5XY+6Y²=0,求(X²+3XY)\2Y²的值
x/y=2,求分式x²-xy+3y²/x²+xy+6y²
已知x/y=3,求x²+2xy-3y²/x²-xy+y³的值
已知非零实数x,y满足x²-4xy+4y²=0,求分式2x-y除以2x+y的值
x²+y²+4x-8y+20=0,求分式x²-y²/xy的值
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
若x/y=2,求分式(x²-xy+3y²)/(x²+xy+6y²)的值
已知3x²+xy-2y²=0(x≠0,y≠0),求x/y-y/x-x²+y²/x
已知3x+2y=0,求代数式(x²+xy-y²)÷(x²-xy+y²)的值.