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平行四邊形

Author:Yip Chi Wai

Topic:Parallelogram

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三位數除以一位數（二）
兩組對邊相等的四邊形
【案例】圆柱体内放置一个大球六个小球
四邉形 (四年級) 教師版
錐體建築師

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龍騰4_1-1講進4
Meaning of Negative Indices 負指數的意義
Quiz on Solving Right Triangles (Finding Angles) 解直角三角形：測驗2（求角度）
中間人
橢圓1--四圓心近似法

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Polynomial Functions
Vectors 2D (Two-Dimensional)
Cuboid
Sine
Angles

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