Răspuns :
123+n / 2 = 89,5
123+n= 179
n=179-123= 56
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Verificare: 123+56 / 2 = 179/2 =89,5 c0rect.
123+n= 179
n=179-123= 56
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Verificare: 123+56 / 2 = 179/2 =89,5 c0rect.