若a、b互为相反数，c、d互为倒数，则2分之cd+a+b=

Question

如题所述

Answer 1

若a、b互为相反数，c、d互为倒数
那么 a+b=0 c*d=1
2分之cd+a+b
=1/2+0
=1/2

Answer 2

a+b=0
cd=1
cd/2+a+b
=1/2+0
=1/2

Answer 3

cd/2+a+b
=1/2+0
=1/2