3)
1) 2 7/15 - 5/12 = 2 28/60 - 25/60 = 2 3/60 = 2 1/20
2) 4 1/10 : 2 1/20 = 41/10 * 20/41 = 2
3) 2 * 5/6 = 5/3 = 1 2/3
4) 2 1/3 + 1 2/3 = 3 3/3 = 4
ответ: 4
4)
1) 2 1/6 + 8/15 = 2 5/30 + 16/30 = 2 21/30 = 2 7/10
2) 1 1/2 : 2 7/10 = 3/2 * 10/27 = 5/9
3) 5/9 * 1 4/5 = 5/9 * 9/5 = 1
4) 4 5/12 - 1 = 3 5/12
ответ: 3 5/12