40-13=27
65-13=52
60-13=47
20-13=7
70-13=57
a)
1. а=40 = 27
2. а=65 = 52
3. а=60 = 47
4. а=20 = 7
5. а=40 = 27
6. а=70 = 57
б)
1. с=8 = 57
2. с=7 = 56
3. с=5 = 54
4. с=6 = 55
5. с=2 = 51
6. с=9 = 58
