解:
1/(2*4)+1/(4*6)+1/(6*8)+.....+1/(2006*2008)
=1/2*(1/2-1/4)+1/2*(1/4-1/6)+1/2*(1/6-1/8)+......+1/2*(1/2006-1/2008)
=1/2*(1/2-1/4+1/4-1/6+1/6-1/8+....+1/2006-1/2008)
=1/2*(1/2-1/2008)
=1/2*(1003/2008)
=1003/4016
希望对你有帮助.
1/(2*4)+1/(4*6)+...+1/(2006*2008)
=1/2*(1/2-1/4)+1/2*(1/4-1/6)+...+1/2*(1/2006-1/2008)
=1/2*[(1/2-1/4)+(1/4-1/6)+...+(1/2006-1/2008)]
=1/2*(1/2-1/2008)
=1003/4016
=1/2(1/2-1/4+1/4-1/6+1/6-1/8+···+1/2004-1/2006+1/2006-1/2008)
=1/2(1/2-1/2008)
=1003/4016