1. а) 1 4/9 + 2 5/18 = 1 8/18 + 2 5/18 = 3 13/18
б) 3 5/24 - 1 7/36 = 3 15/72 - 1 14/72 = 2 1/72
в) 2 7/30 + 3 9/20 - 4 59/60 =
2 14/60 + 3 27/60 - 4 59/60 =
5 41/60 - 4 59/60 = 341/60 - 299/60 = 42/60 = 7/10
2. а) 3 1/5 * 3 1/8 = 16/5 * 25/8 =
10/1 = 10
б) 1 4/11 : 1 2/13 = 15/11 * 13/15 =
13/11 = 1 2/11
в) 2 3/4 : 1 3/8 * 3 2/7 = 11/4 * 8/11 * 23/7 = 2 * 23/7 = 46/7 = 6 4/7
3. 1) 3:3 3/4 = 3 * 4/15 =12/15 =4/5
2)2 2/5 * 2 1/2 = 12/5 * 5/2 = 6
3) 4/5 + 6 - 3 5/6 = 4/5 + 6/1 - 23/6 = 24/30 + 180/30 - 115/30 = 89/30 = 2 29/30