Mathematics
Senior High

数Bの数列の質問です。黄色線のやってることが分かりません。

ex) 4H1) in 7 7.1. kai n I (Mk² nk) 191 7+72+734…+7n 9 1/ 7(1-7^) +7 1 / 2 (19k +1_ qk) - 6 (ight! — 171) k (1-u4) ² 7.7k 11 6xgk

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