1.
(1 3/5 + 1,8) * 1/2 = 1 7/10 (или 1,7),
1) 1 3/5 + 1,8 = 8/5 + 18/10 = 16/10 + 18/10 = 34/10 = 3 2/5 (или 3,4),
2) 3 2/5 * 1/2 = 17/5 * 1/2 = 17/10 = 1 7/10 (или 1,7),
2.
(6 - 4 8/15) : 2,2 = 2,3,
1) 6 - 4 8/15 = 5 15/15 - 4 8/15 = 1 7/15,
2) 1 7/15 : 2,2 = 22/15 : 22/10 = 22/15 * 10/22 = 10/15 = 2/3,
3.
(1,25 + 1/6) * 2,4 = 3 2/5 (или 3,4),
1) 1,25 + 1/6 = 125/100 + 1/6 = 375/300 + 50/300 = 425/300= 17/12= 1 5/12,
2) 1 5/12 * 2,4 = 17/12 * 24/10= 34/10 = 3 2/5 (или 3,4),
4.
(5,4 - 2 1/3) : 7 2/3 = 2/5 (или 0,4),
1) 5,4 - 2 1/3 = 54/10 - 7/3 = 162/30 - 70/30 = 92/30 = 3 1/15,
2) 3 1/15 : 7 2/3 = 46/15 : 23/3 = 46/15 * 3/23 = 6/15 = 2/5 (или 0,4),
5.
(2 1/3 + 0,25) * 0,12 = 31/100 (или 0,31),
1) 2 1/3 + 0,25 = 7/3 + 1/4 = 28/12 + 3/12 = 31/12 = 2 7/12,
2) 2 7/12 * 0,12 = 31/12 * 12/100 = 31/100 (или 0,31),
6.
(7,6 - 4 3/4) : 1,9 = 1 1/2 (или 1,5),
1) 7,6 - 4 3/4 = 76/10 - 19/4 = 152/20 - 95/20 = 57/20 = 2 17/20 (или 2,85),
2) 2 17/20 : 1,9 = 57/20 : 19/10 = 57/20 * 10/19 = 57/38 = 1 19/38 = 1 1/2 (или 1,5)