Răspuns :
a : 7 = 9.rest 0
a = 9 × 7 + 0
a = 63
a : 7 = 9 rest 2
a = 9 × 7 + 2
a = 65
a : 7 = 9 rest 4
a = 9 × 7 + 4
a = 67
a : 7 = 9 rest 6
a = 9 × 7 + 6
a = 69
a : 7 = 9 rest 8
a = 9 × 7 + 8
a = 71
a : 7 = 9.rest 0
a = 9 × 7 + 0
a = 63
a : 7 = 9 rest 2
a = 9 × 7 + 2
a = 65
a : 7 = 9 rest 4
a = 9 × 7 + 4
a = 67
a : 7 = 9 rest 6
a = 9 × 7 + 6
a = 69
a : 7 = 9 rest 8
a = 9 × 7 + 8
a = 71