4/3+16/15+36/35+64/63+100/99+144/143=?
问题描述:
4/3+16/15+36/35+64/63+100/99+144/143=?
答
原式=1+1/3+1+1/15+1+1/35+……+1+1/143
=6+1/2×(1-1/3+1/3-1/5+1/5-1/7+1/7-1/9+1/9-1/11+1/11-1/13)
=6+1/2×(1-1/13)
=6又6/13