Mathematics
Senior High
Resolved
この二つの式はそれぞれ、どいういう時に使い分けるのか教えてください！
初唄
rキ1のとき
a(1-r")
Sn =
a(r"-1)
1-r
rー1
Answers
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この二つの式はそれぞれ、どいういう時に使い分けるのか教えてください！
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![⑶で、第15項と第40項を求めて[1]の公式を使うのはできませんか？
2枚目どこまちがって... - 1](https://d1e9oo257tadp1.cloudfront.net/uploads/qa_question_image/file/1807803/thumb_l_webp_17829043939990.webp?Expires=1787783807&Signature=YPRjwDC7TeTrFVxSBOoih2B9Wci3rBYfuE5Xf4tU6sMNZ2X3Nrsdgo1DWfSkUWPDwQyzfgWHXfey2AQg8bOG1fsCstu6nzbRRAEWGYbLNnzYefEmmRIJZS1caelul-yxzA2RrTWJr7MP1jZBJqGsFEpXuXap1Oyqv8HW4qc6iFXj6Go2mVWuFYmpXCLjZlxvBL9B-zpvxaGp8qR8sfgRzShVH6fjecbdHGwjgQ8N3j3Rf875d39fF7q0jD5khdlqbvsWV7DsASGEFr6hpg27BdVrTqqhmKf3VCEnrEwvIEEEivdNXSH22CU7Tuc3nQzGzpYSmJbc2fH7ipYJRhBoCg__&Key-Pair-Id=K2W722D70GJS8W&Expires=1787783807&Signature=EYbodkrNLWHvR2shBIwZpsYVFYObK1E9RzQqFBfMwnFQ2oeNEzZa93mXKuDwtS8ee3DgqVaRDLgDNa~VBAthaDHM-Jq792Me1~W6KsJVYHokaFU6Bu0SpIxQLAVl8qfAl5v2xqSJpRVatymryJpwbnGsRWqBcGOx4uCSyHz-4ZFWnyWo3QldL5td7nH6aXIIaZeCiYPUhqbG4Deqt-qnJFfCappWL3X1MeXSehVLq34Q-0HkvVrlpw8EudnwqOwUldk6e2TgJJdQsEpztQDXN8zVX24t4XKOLoCKHOapzd3fEsnX4nGuvpgi90Ru9lDDUJkiEGYZmK-yiwVzD0tmwQ__&Key-Pair-Id=K2W722D70GJS8W)
![⑶で、第15項と第40項を求めて[1]の公式を使うのはできませんか？
2枚目どこまちがって... - 2](https://d1e9oo257tadp1.cloudfront.net/uploads/qa_question_image/file/1807804/thumb_l_webp_17829043940640.webp?Expires=1787783807&Signature=l8QxmvpsWpKN5f4TdA1tvs99DFaJSYCfI9TxaqMfMcNvK-WaUMXNgEDbz4DOTbnqkgKpLpaqfOC4540doScDSS9dOaSu44kaFJ0qZ5xv5r2I3lF3YozzqzGRpy7YPeKcST-o0YRuNZNEF2-dpB85rhxRBwzkZ3dK0xfAwstKNRM1ntmvJtN4NwBLDugNO~z70XdG8VPE9dcnRUSWC-AVczTOZHPzTsrdHf4QH7txGsI~3Sf0jhuhoswS8bYYJViDdCoRIrJ1R5kxAyJszHtXocx0~EVHxeq020jPw1cELbzBJtuQkfgI7oS3Ra76VnjoRB04MBswIwlXEds7bTp5Iw__&Key-Pair-Id=K2W722D70GJS8W&Expires=1787783807&Signature=fZJQtwGZDCXKWdplm6eHwCYdIsi0lQVBEL2Va3IwLV5sXye~ESnfzfY5BLGTmVK~FNdKAZbZggO6HuDRvUT5qMPzpr~P59mOQSCgC61rSKIroiDPKNiVMvtQ0HQ1naeogzkPs8VmYQbrjE5KNllO4zG-htONtuBQz1lu~gulTzthndD0E2gSRBDR7AgeO~vPKgKYzXLCTOK2jej7ylEvlpEPQKEQlNp0ehrweZbAl4j1065aD15X~RXbv3dC8-zV2haUTzjBC0Y7yCkT58VPVD9m3c4lgeg25ZL1FdNB-q2hmYN4k4FZAXxhtB9ZO4KtvxR8uu2wk7tq4FuC2OzVqw__&Key-Pair-Id=K2W722D70GJS8W)
ありがとうございます！