(2/15 + 1 7/12) · 30/103 - 2 : 21/4 · 9/32 + 2 1/3 = 2 61/84
1) 2/15 + 1 7/12 = 8/60 + 1 35/60 = 1 43/60
2) 1 43/60 · 30/103 = 103/60 · 30/103 = 30/60 = 1/2
3) 2 : 21/4 = 2 · 4/21 = 8/21
4) 8/21 · 9/32 = (1·3)/(7·4) = 3/28
5) 1/2 - 3/28 = 14/28 - 3/28 = 11/28
6) 11/28 + 2 1/3 = 33/84 + 2 28/84 = 2 61/84
ответ: 2 целых 61/84.
(2/15 + 1 7/12) · 30/103 - 2 : 21/4 · 9/32 + 2 1/3 = 2 61/84
1) 2/15 + 1 7/12 = 8/60 + 1 35/60 = 1 43/60
2) 1 43/60 · 30/103 = 103/60 · 30/103 = 30/60 = 1/2
3) 2 : 21/4 = 2 · 4/21 = 8/21
4) 8/21 · 9/32 = (1·3)/(7·4) = 3/28
5) 1/2 - 3/28 = 14/28 - 3/28 = 11/28
6) 11/28 + 2 1/3 = 33/84 + 2 28/84 = 2 61/84
ответ: 2 целых 61/84.