Question

己知a,b互为相反数且a不等于0,c,d互为倒数,lml=2,求m+a/b+2009(a+b)/2010-cd的值.

Answer 1

a,b互为相反数且a不等于0,c,d互为倒数,lml=2,

则a+b=0 cd=1 m=±2

所以：m+a/b+2009(a+b)/2010-cd

=m+（-1）+0+1

=m

=±2