Jak się dodaje potęgi o tej samej podstawie, takie jak te:
?
3^n + 3^(n+1) =3^n + 3^n * 3 =3^n(1+3) = 4 *3^n
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3^n + 3^(n+1) =3^n + 3^n * 3 =3^n(1+3) = 4 *3^n