Question

1/2*4+1/4*6+1/6*8+.+1/2006*2008=

Answer 1

(1/2*4)+(1/4*6)+(1/6*8)+.+(1/2006*2008)

=1/2(1/2-1/4+1/4-1/6+1/6-1/8+.+1/2006-1/2008)

=1/2(1/2-1/2008)

=1003/4016

盐中的不,我们老师刚讲过.