四則運算 (四年級) ~ 清大附小 馮汝琪老師(有cc字幕)
Synopsis
孩子們踏著前面學習單元的兩步驟解題基礎，在此單元開始學習併式及逐次減項的數學表徵，還要熟悉併式的規則(四則運算約定)， ...
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