✨ Best Answer ✨ aporon about 3 yearsago (k+2)!=(k+2)×(k+1)!と考えれば通分できますね み about 3 yearsago ありがとうございます！！ Post A Comment
![(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_1717B3E3-8A84-49A5-82D1-466207496D96.jpg?Expires=1788314593&Signature=qP2lItuVqoIRIJ3iFru7zmYjFSXWBW5zOoQVxp5-QLOSbDftfnDY49nC5pd9QYLLtSkk0B4nhByrtTeZRt8vSUdHI3zX7d1wpNcAeIuYOtABPekV2ixySpYn51jObJn3p94TceWh9dddVDJwEhPjyhM8QjjI-ba9qo0sznxuNe4oiSd2fiM-OfozDcaUCF-3SiH7LgKCHkAER69sXYyL2TdpnicDRbNCQNAQIFx62qIM-Sxzr5swYwZaKPZ3KZSgJUOpub8n6dhHK5vhwiJ19mmCPud-LZyVNrI46jnEkXhux6hRNNfHafo-FRNPSbTPj6Wsoin-dfM~L3PmSQvdOQ__&Key-Pair-Id=K2W722D70GJS8W)
ありがとうございます！！