1136 1137 Плиииз матем 5 класс

№1136.
1). 3 + 8 5/12 = 2 12/12 + 8 5/12 = 11 5/12. 
2). 10 6/7 - 3 = 9 13/7 - 3 = 6 13/7 = 7 6/7 
3). 4 2/13 + 5 7/13 = 9 9/13
4). 8 7/12 - 4 2/12 = 4 5/12 
5). 4 8/11 + 5 7/11 = 9 15/11 = 10 4/11
6). 7 5/9 - 2 8/9 = 6 14/9 - 2 8/9 = 4 6/9 = 4 2/3
7). 7 - 3/8 = 6 8/8 - 3/8 = 6 5/8
8). 10 - 3 7/15 = 9 15/15 - 3 7/15 = 6 8/15