Помогите пожалуйста номер 511 .
1) 1/3 + 1/5 = 5/15 + 3/15 = 8/15 2) 1/5 + 1/9 = 9/45 + 5/45 = 14/45 3) 1/7 + 1/4 = 4/28 + 7/28 = 11/28 4) 1/3 + 1/8 = 8/24 + 3/24 = 11/24 5) 1/3 + 1/2 = 2/6 + 3/6 = 5/6 6) 1/6 + 1/7 = 7/42 + 6/42 = 13/42