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鉛筆畫圓
Author:
Ching-Hui Chou
GeoGebra
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拼砌四邊形
兩位數加法
四邉形 (四年級) 教師版
sanjiaohanshu
【案例】2018年全国1卷理科12题
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用極座標做時鐘
二元一次方程式2
P.8.20_1
謝爾賓斯基三角形
活动三：应用性质
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Pyramid
Triangles
Special Points
Root
Square