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proof51 柯承志
Author:
郭亮偉
GeoGebra
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異分母分數減法
三位數除以一位數（二）
【案例】圆柱体内放置一个大球六个小球
兩位數除以一位數（一）
四邉形 (四年級) 教師版
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七巧板揖人
Bearings 方位
坐标变换
圆与它的外切圆
Trianglar prism
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Plane Figures or Shapes
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Sequences and Series
Trigonometry
Indefinite Integral