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Author:
Choi King Hong
GeoGebra
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算柱 (兩位數)
異分母分數減法
拼砌四邊形
兩位數除以一位數（二）
兩組對邊相等的四邊形
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方格紙上畫長方形2
七巧板
圓柱截橫
平面直角坐标系
七下数学案例教程2-对顶角和邻补角例题
Discover Topics
Optimization Problems
Addition
Means
Natural Numbers
Bar Chart or Bar Graph