(1)若x+y=2,且(x+2)(y+2)=5,求x²+xy+y²的值
1/x+1/y=5,求2x-3xy+2y/x²+xy+y的值
已知x+y=-1,xy=-2,求代数式-5(x+y)+(x-y)+x(xy+y)的值
若正数x,y满足x²-y²=2xy,求(x-y)/(x+y)的值
4/X+1/Y=2,XY=-1,求代数式4Y-X/X-2Y/(x+2y-12Y²/x-2y)的值
已知x>0,y>0,且x+6y=5根号xy,求(2x+根号xy-y)分之(x+根号xy+2y)的值
已知x+y=-1,xy=-2,求代数式-5(x+y)+(x-y)+2(xy+y)的值
已知X+Y=-1,xy=-2,求代数式-5(x+y)+(x-y)+(xy+y)的值
已知5x-4y=0且xy不等于0,求x^2+y^2/x^2-y^2-x+y/x-y的值
若1/x-1/y=3,求5x+2xy-5y/x-4xy-y的值
已知x-7y=0,且y≠0,求2x²﹢xy-3y²分之x²-3xy+y²的值
若x>0,y>0,且√x(√x+√y)=3√y(√x+5√y),求(2x+2√xy+3y)/(x-√xy+y)的值.
若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值