載入中... 相關課程 Back 如果lal+ lbl=0,那麼a、b都等於0,為什麼? 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. 如果lal+ lbl=0,那麼a、b都等於0,為什麼? 上傳學習單 下載學習單