来自陈荣的问题
1.已知x+y=-4,xy=-12,则y+1/x+1+x+1/y+1等于?2.若1/a+1/b=1/a-b,则b/a-a/b等于?3.若x/y+z=a,y/x+z=b,z/x+y=c,且x+y+z≠0,则a/1+a+b/1+b+c/1+C等于?..
1.已知x+y=-4,xy=-12,则y+1/x+1+x+1/y+1等于?
2.若1/a+1/b=1/a-b,则b/a-a/b等于?
3.若x/y+z=a,y/x+z=b,z/x+y=c,且x+y+z≠0,则a/1+a+b/1+b+c/1+C等于?
..
