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翰林數學_2下_CH4-2_平行四邊形性質
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翰林數學
GeoGebra
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畫出對稱圖形
兩位數除以一位數（一）
【案例】2018年全国1卷理科12题
異分母分數減法
兩位數加法
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四下_認識小數(學生版)
ggggggg
軌跡觀察---兩圓上線段中點
兩圓滾動軌跡
拋物線6--包絡線法
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