Question

已知a、b互为相反数,m、n互为倒数,c的绝对值为8,求3a+3b+2009mn+c的值

Answer 1

a+b=0

mn=1

|c|=8

c=±8

c=8时：

3a+3b+2009mn+c

=0+2009+8

=2017

c=-8时：

3a+3b+2009mn+c

=0+2009-8

=2001