365. Выполните действие:

a) 1/2 + 1/3 = 3/6 + 2/6 = 5/6.
б) 1/4 + 2/5 = 5/20 + 8/20 = 13/20.
в) 2/3 + 1/4 = 8/12 + 3/12 = 11/12.
г) 3/4 + 2/5 = 15/20 + 8/20 = 23/20.
д) 5/7 - 1/6 = 30/42 - 7/42 = 23/42.
е) 3/4 - 1/3 = 9/12 - 4/12 = 5/12.
ж) 1/8 + 1/12 = 3/24 + 2/24 = 5/24.
з) 2/3 - 1/6 = 4/6 - 1/6 = 3/6 = 1/2.
и) 1/2 - 5/12 = 6/12 - 5/12 = 1/12.
к) 5/12 - 2/9 = 15/36 - 8/36 = 7/36.
л) 1/8 + 7/12 = 3/24 + 14/24 = 17/24.
м) 3/4 - 1/6 = 9/12 - 2/12 = 7/12.
н) 5/9 + 3/4 = 20/36 + 27/36 = 47/36.
о) 23/40 - 3/8 = 23/40 - 15/40 = 8/40 = 1/5.
п) 9/35 - 3/28 = 36/140 - 15/140 = 21/140 = 3/20.