Mathematics
Senior High
何をやるのか全く分からないので教えて欲しいです
52. 次の数列の第k項αk と, 初項から第n項までの和Snを求めよ。
(1) 1, 1+5, 1+5+9,, 1+5+9+...+(4n-3)
□(2)* 1, 1+4, 1+4+7, 1+4+7+10, 1+4+7+10+13,
□ (3) 1, 1+3, 1+3+9, 1+3+9 +27, 1 +3 +9 +27+81,
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![(2)[1]の式はなぜこうなるのでしょうか？
解説お願いします🙏🏻 - 1](https://d1e9oo257tadp1.cloudfront.net/uploads/qa_question_image/file/1810073/thumb_l_webp_1717B3E3-8A84-49A5-82D1-466207496D96.webp?Expires=1787239286&Signature=dFyWlCuTcBO9YryhDPEHVCEUP464wkevx~DGHyG~fLhMDBmAjoutINPVARI-Xceh3aU-19wbN2hwQ3gxczJfWJWvaQTY-EWIrY2SVDyGpOe45YqGwxpwLZXpZXD1dNxseYgiEtgJoqacd4jG8K33hSSJK5OFNw6k5OsXtzjOOqB5f1p48QzNPu4cqBjZOIxKnu0MdkZKAxAhtg2RhK2~vRcL7yvJQWqxzsGAcIeXSr6-~mcmelycpLYJlRlogzpCak5W9Pvg5evjkNfEIo0ymYY-JXkq5XRHv4eSXJ5geDADc1~byg8T5tyPFwILsEG28i2mjA1Y2Gcivr4hcHUp7g__&Key-Pair-Id=K2W722D70GJS8W&Expires=1787239286&Signature=jZlyNYCsdmwPNXXL91ZbcZ2aXWLW8NIhmq~uespFTX2vPxBXO0PR4W8IwlfwpZXV93SYplsWAjI1oeGyL2t9EOoJmv0b5-tR~1lPp8f2Ob2sdKjauCLUI0umjUyv2G34W6q0RpswoC0f0xMvO0yIr3d~u5c~DVLZHg-IbJhheCxNhayBKS5jCFDQQjjdk7jWb9aPiffgiDF1R2Y1~QbdaPPvTsr5rVt2a3SerjYNmTLdI6BNKB9966rMANSfmhXkqmHR1NQ2ze2TI67RrRZCo0pf5NmnBi~DoGoAR1H9Ow4iT1Pz8c3Edh3eI8r8sIbx6Du-059QvnybmoBhbHkfNg__&Key-Pair-Id=K2W722D70GJS8W)
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