若ab互為相反數(shù),cd互為倒數(shù)，m的絕對(duì)值為2

則，a+b=0   cd=1，m=2,(-2)

1. 當(dāng)m=2

   a+b/a+b+m         +m的平方-cd
   =0/(0+2)+2^2-1

   =3

2. 當(dāng)m=-2

   a+b/a+b+m         +m的平方-cd
   =0/(0-2)+(-2)^2-1

   =4-1

   =3