Mathematics
Senior High

数列の問題で写真の式の最後の変形の部分のやり方を教えてください。

:\2/ an= 1+bn 1-6n 1+ 1 3 ( 2 1-1/2 (1) 32 n-1 n-1 = イ 3・21 +1 3.2"-1-1

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