a. 1. 0, 62 : 0, 2 = 3, 1
2. 15/2 - 31/10=15/2 x 5 = 75/10 - 31/10 = 44/10
3. 0, 5 x 4, 4 = 2, 2
4. 13/2 = 6, 5 = 6,5 : 1,3 = 5, 0
5. 2, 2 + 5, 0 = 7, 2
b. 1. 0,6 x 0,6 = 0, 36
2. 1, 95 : 0, 5 = 3, 9
3. 8, 1 - 3, 9 = 4, 2
4. 3, 2 : 21 = 0, 15
5. 4, 2 x 0, 15 = 0, 63
6. 0, 36 + 0, 63 = 0, 99
