completed Chapter 3 on sequences in Grade 1 math textbook, specifically Section 3 on "Sum of the First n Terms of an Arithmetic Sequence," which is near the end. He also covered more than half of his...轉碼失敗！請您使用右上換源切換源站閱讀或者直接前往源網站進行閱讀！class: "Yesterday Zhao Chengyan invited a group of people from Jianyang Sports School nearby, blocking Zhang Xian and company; did you know"Su Can shook his head to indicate he didn't know. Jiang Ming...