Back 【解題】7 的 3 倍可以記成 7 乘以 3 登入觀看 ⇐ Use this menu to view and help create subtitles for this video in many different languages. You'll probably want to hide YouTube's captions if using these subtitles. 【解題】7 的 3 倍可以記成 7 乘以 3 上傳學習單 下載學習單