2/35+2/63+2/99+2/143
=2/5*7+2/7*9+2/9*11+2/11*13
=1/5-1/7+1/7-1/9+1/9-1/11+1/11-1/13
=1/5-1/13
=13/65-5/65
=8/65
2/35+2/63+2/99+2/143=?
5个回答
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