Răspuns :
n • 7+7-7=11 • 7
n • 7+7-7=77
n• 7+7=77+7
n •7+7=84
n•7=84-7
n•7=77
n=77:7
n=11
n • 7+7-7=77
n• 7+7=77+7
n •7+7=84
n•7=84-7
n•7=77
n=77:7
n=11
Răspuns:
n × 7+7-7=11 × 7
n × 7+7-7=77
n × 7+7=77+7
n × 7+7=84
n × 7=84-7
n × 7=77
n=77:7
n=11
Pls coroana ca am nevoie