1\1x3+1\3x5+1\5x7+1\7x9+.+1\99x101=
问题描述:
1\1x3+1\3x5+1\5x7+1\7x9+.+1\99x101=
答
1/2(1-1/3+1/3-1/5****+1/99-1/101)
=1/2(1-1/101)
=50/101