1x3/1+3x5/1+5x7/1+...+99x101/1
问题描述:
1x3/1+3x5/1+5x7/1+...+99x101/1
=(要求写过程)
1
-----
1x3
答
原始等于2*(1-1/3+1/3-1/5+...1/99-1/101)
=2*(1-1/101)
=2*100/101
=200/101