Răspuns :
¤ 41 .
A + 3 : 6 , 10 , 11 , 7 , 12 , 8 , 9 ,13
a × 3 : 9 , 21 , 24 , 12 , 27 , 15 , 18 , 30
a - 3 : 0 , 4 , 5 , 1 , 6 , 2 , 3 , 7 .
¤ 42 .
3 × 6 = 18 12 = 3 × 4 2 × 2 × 3 = 12
3 × 8 = 24 21 = 7 × 3 4 × 3 × 2 = 24
5 × 3 = 15 9 = 3 × 3 3 × 3 × 2 = 18
9 × 3 = 27 6 = 2 × 3 2 × 4 × 2 = 16
3 × 1 = 3 24 = 8 × 3 3 × 5 × 1 = 15
A + 3 : 6 , 10 , 11 , 7 , 12 , 8 , 9 ,13
a × 3 : 9 , 21 , 24 , 12 , 27 , 15 , 18 , 30
a - 3 : 0 , 4 , 5 , 1 , 6 , 2 , 3 , 7 .
¤ 42 .
3 × 6 = 18 12 = 3 × 4 2 × 2 × 3 = 12
3 × 8 = 24 21 = 7 × 3 4 × 3 × 2 = 24
5 × 3 = 15 9 = 3 × 3 3 × 3 × 2 = 18
9 × 3 = 27 6 = 2 × 3 2 × 4 × 2 = 16
3 × 1 = 3 24 = 8 × 3 3 × 5 × 1 = 15