Mathematics
Senior High
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(2)の公差の出し方を教えて欲しいです🙏
18 次の等差数列について, [] に指定されたものを求めよ。
(1) 初項 27, 初項から第18項までの和が945 [公差]
(2)初項 48,末項-20, 和 490 [公差と項数]
*(3)第5項が12,初項から第5項までの和が20 [初項と公差
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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)
理解しました！ありがとうございます！