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餘弦的定理
Author:
NG Chun Yee
GeoGebra
New Resources
異分母分數減法
三位數除以一位數（二）
球體建築師
四邉形 (四年級) 教師版
找出對稱軸
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三角形與邊上一點求正三角形
角度比較
Similar Triangles
集合的运算
剪切成正三棱柱（制作：李三军，修订：孟宝兴）
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Numbers
Perimeter
Circle
Parabola
Intersection