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Mars Retrograde
Author:
Chenwei Chen
GeoGebra
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找出對稱軸
柱體建築師
四邊形的特性
【案例】2018年全国1卷理科12题
兩位數除以一位數（一）
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Is this a prism 5
Perimeter
circle: line from centre
venn图
时钟
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Standard Deviation
Means
Fractions
Matrices
Exponent