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Rotational and reflectional symmetry of a regular polygon
Author:
Ngan Hok Hei
,
lamanleung
GeoGebra
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【案例】2013年安徽高考15题
球體建築師
【案例】圆柱体内放置一个大球六个小球
三位數除以一位數（二）
兩位數除以一位數（二）
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了解圓方程(1)
一題多解,托勒密,代數,三角,柯西,鍾元杰
ex 4
Copy of area
國旗
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Multiplication
Congruence
Perimeter
Hypothesis Testing
Intersection