Răspuns:
13) a :8 +9
64 8 17
32 4 13
40 5 14
72 9 18
56 7 16
a : 6 - 4
36 6 2
24 4 0
48 8 4
54 9 5
42 7 3
ex 14
a = 7 × 7 - 3 × 3 - 5 × 6
a = 49 - 9 - 30
a = 40 - 30
a = 10
b = 63 : 7 + 5 × 4 - 3 × 3
b = 9 + 20 - 9
b = 29 - 9
b = 20
c = 42 : 6 + 5 × 6 + 3 × 1
c = 7 + 30 + 3
c = 37 + 3
c = 40
6 × a - 2 × b + c = 4 × a + 3 × b - c
6 × 10 - 2 × 20 + 40 = 4 × 10 + 3 × 20 - 40
60 - 40 + 40 = 40 + 60 - 40
20 + 40 = 100 - 40
60 = 60
