かき 2個月以前 参考に https://ic0.tv/class/mathematics/high-school-freshman/022/3jishiki-tenkai-insubunkai/ 動画の下も 留言
![3の答えが243[1ー(3ぶんの2)n]
4の答えが16[(2ぶんの3)nー1]なんですけ... - 1](https://d1e9oo257tadp1.cloudfront.net/uploads/qa_question_image/file/1753364/thumb_l_5A3BEECC-3CE1-47E2-8BAC-291A1EFB931E.jpg?Expires=1748597652&Signature=etT5y0O6JkhW7frBRKtCeF~jQ7WS-yqaQPfkuNuSiob2ls2KlNYFaoQbyOzNnWoQGSbP4jGr4iLbEo550FG8xqWAPAq58uUYSaEuBcgjKeXW1Xu52mWxhL3tzRb5DlOfEKfTrx4x48pFZ5i3245BIbK37-08m9JFxSdv-oU7cKjuR3etg0OapYgIp5lwukkJlbToVhTuV9MedFOUq537Ic9GxvtpibeoWIZ4uhn4M6c0eAFXfxyeoosIPmy-ZxDu7ApIvcoKDZ~u7VL-IU7-kmttqpSEs7Wqh84EZs10b7oQd~j6NZmKtD3jIUOmHqe-x3CMXa3iEHaJSFhXESEFOQ__&Key-Pair-Id=K2W722D70GJS8W)
![5の答えが初項1、公比3
6の答えが7分の2[1ー(ー6)n]なんですけどなんでですか？や... - 1](https://d1e9oo257tadp1.cloudfront.net/uploads/qa_question_image/file/1753360/thumb_l_713E2827-BC32-4FBC-9B8F-F80EE798E8FC.jpg?Expires=1748597652&Signature=y-GTLV0WIdiCqFZQ~kneWxnwyQ526ECyfbvih1pLwQyFegxzVmDqmBi4a~UyeLUHR9tBj6QkUYuo5ath~YpqFEqbfT21Wmt9TXJDQ56dk8XiEjr3xZ7tp7Qo0eWUwAX37cdoC0XaAOnLNyddccGEVh5UAsbiTo-yPFIOHeUjb83j1YmtbA~~66sNqLQPY~OUWRs2F2NTQX-z53~rDLRLX9US9Tma06maAwnEd2eRVVhqBlVYprWVO91Y7T7sVSfF7Hrg~1gn79-7R1oOOgtyK3OUZndphE3yQrdtsqnvWTO~8yD0Oh-sKsUjijapz8CD7PFPwcyL3gOOLsSqdy7WUw__&Key-Pair-Id=K2W722D70GJS8W)
