1/3+1/5+1/7+1/9+7/15
1/3+1/5+7/15 привести к знаменателю 15
5/15+3/15+7/15 = 15/15 = 1
1/7+1/9 =9/63+7/63=16/63
1+16/63=1 целая и 16/63
