Пошаговое объяснение:
а) 5 7/21 + 2 9/21 = 7 16/21
б) 20 3/4 - 15 1/4 = 5 2/4 = 5 1/2
в) 7 5/8 + 3 3/8 = 10 8/8 = 11
г) 12 4/8 - 4 4/8 = 8
д) 11 4/17 + 5 16/17 = 16 20/17 = 17 3/17
е) 11 1/9 - 2 7/9 = 10 10/9 - 2 7/9 = 8 3/9 = 8 1/3
Пошаговое объяснение:
а) 5 7/21 + 2 9/21 = 7 16/21
б) 20 3/4 - 15 1/4 = 5 2/4 = 5 1/2
в) 7 5/8 + 3 3/8 = 10 8/8 = 11
г) 12 4/8 - 4 4/8 = 8
д) 11 4/17 + 5 16/17 = 16 20/17 = 17 3/17
е) 11 1/9 - 2 7/9 = 10 10/9 - 2 7/9 = 8 3/9 = 8 1/3