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翰林數學_1下_CH2-1_直角坐標平面的認識
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翰林數學
GeoGebra
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錐體建築師
GeoGebra笔记功能体验课件
三位數除以一位數(二)
四邉形 (四年級) 教師版
兩位數加法
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滾動
折扣 例3
數的組合 (簡易)
folding paper by Mr LO WY
两角和的正弦公式几何证明(改进)
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Arithmetic Operations
Inequalities
Fractions
Trapezoid
Tree Diagrams