3 mũ n+2 - 3 mũ n+1 =1458 2 mũ n-1 + 4.2 mũ n =9.2 mũ 5 3 mũ n+2 + 5.3 mũ n+1 =216 5 mũ n+1 - 5 mũ n -1 =125 mũ 4 . 2 mũ 3.3

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