Răspuns :
a + b = 12
b + c = 15
100 + 3 b + 3 c - 99 =
100 + 3 × ( b + c ) - 99 =
100 + 3 × 15 - 99 =
100 + 45 - 99 =
145 - 99 = 46
a + b = 12
b + c = 15
100 + 3 b + 3 c - 99 =
100 + 3 × ( b + c ) - 99 =
100 + 3 × 15 - 99 =
100 + 45 - 99 =
145 - 99 = 46