2/7+1/6= 7/15-1/15= 2/9+7/18= 14\21-4/7= 4/15+1/3= 2/3-1/9= 4/5+6/25= 11/12-1/12 = 1/2+2/7= 13/15-2/3= 3/8+1/3= 4/5-1/10=

Для того, чтобы выполнить действия с дробями, нужно дроби привести к общему знаменателю. Далее по возможности сократить.№12/7 + 1/6 = 12/42 + 7/42 = 19/42.№27/15 - 1/15 = 6/15.№32/9 + 7/18 = 4/18 + 7/18 = 11/18.№414/21 - 4/7 = 14/21 – 12/21 = 2/21.№54/15 + 1/3 = 4/15 + 5/15 = 9/15.№62/3 - 1/9 = 6/9 – 1/9 = 5/9.№74/5 + 6/25 = 20/25 + 6/25 = 26/25 = 1 1/25.№811/12 - 1/12 = 10/12 = 5/6.№91/2 + 2/7 = 7/14 + 4/14 = 11/14.№1013/15 - 2/3 = 13/15 – 10/15 = 3/15 = 1/5.№113/8 + 1/3 = 9/24 + 8/24 = 17/24.№124/5 - 1/10 = 8/10 – 1/10 = 7/10.№131/9 + 2/9 = 3/9 = 1/3.№145/24 - 1/6 = 5/24 – 4/24 = 9/24 = 3/8.№1512/19 + 7/19 = 19/19 = 1.