Răspuns :
21-7=14
Scadem diferenta:
14-4=10:2=5 (a treia zi)
5+4=9 (a doua zi)
Verificare: 5+7+9=21
Scadem diferenta:
14-4=10:2=5 (a treia zi)
5+4=9 (a doua zi)
Verificare: 5+7+9=21
Răspuns:
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