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直角三角形與正三角形
Author:
李春培
GeoGebra
New Resources
兩組對邊相等的四邊形
畫出對稱圖形
球体的体积推导（优化版）
第八周作业
三位數除以一位數（二）
Discover Resources
waaachen
vector addition and subtraction
Perimeter
七巧板的副本
正弦定理的副本
Discover Topics
Cube
Random Experiments
Sphere
Exponent
Median Value