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Lttcmooc
GeoGebra
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兩位數加法
第八周作业
算柱 (兩位數)
三位數除以一位數（二）
四邊形的特性
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畫三角形 題1d
優良作品2(怡婷)
中心对称
Li Shan Lan Cone Logarithm
面積
Discover Topics
Root
Diagrams
Bar Chart or Bar Graph
Cosine
Quadratic Equations