Предмет: Алгебра, автор: Zhenya4872

докажите что сумма двух последовательных натуральных степеней числа 2 делится на 7

Ответы

Автор ответа: arsenlevadniy
0

2^n+2^(n+1)=2^n (1+2)=3*2^n

делится на 3.

на 7 не делится.

2^1+2^2=2+4=6.

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