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Author:
李春培
I love you
GeoGebra
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四邊形的特性
兩位數加法
【案例】2018年全国1卷理科12题
算柱 (兩位數)
四邉形 (四年級) 教師版
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只跳躍一次的函數
My second work
Copy of 七巧板
祖暅之《綴術》：「緣冪勢既同，則積不容異。」
矩形等距曲線
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Tree Diagrams
Solids or 3D Shapes
LCM and GCD
Optimization Problems
Step Functions