1,分数裂项.
1*2/1+2*3/1+3*4/1+……+99*100/1
=(1-2/1)+(2/1-3/1)+……+(99/1-100/1)
=1-100/1
=100/99
2,分数乘法
2008*2/1*3/2*……*2008/2007
=1
1,分数裂项.
1*2/1+2*3/1+3*4/1+……+99*100/1
=(1-2/1)+(2/1-3/1)+……+(99/1-100/1)
=1-100/1
=100/99
2,分数乘法
2008*2/1*3/2*……*2008/2007
=1