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2014-10-16T10:44:07+03:00
2/17 +2/7 + 4/13 + 1/7 + 5/17 + 11/13 - 5/17 =2/17+ 5/17- 5/17+2/7+ 1/7+ 4/13 + 11/13=2/17+3/7+15/13=7*13*2/17*7*13+17*13*3/17*7*13+17*15*7/17*7*13=(182+663+1785)/17*7*13=2630/1547=
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