載入中... 相關課程 Back 【觀念】(𝑎+𝑏)(𝑐+𝑑) = 𝑎𝑐+𝑎𝑑+𝑏𝑐+𝑏𝑑 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. 【觀念】(𝑎+𝑏)(𝑐+𝑑) = 𝑎𝑐+𝑎𝑑+𝑏𝑐+𝑏𝑑 上傳學習單 下載學習單