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正弦公式2
Author:
maths324324
GeoGebra
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球体的体积推导
判斷球體
兩位數加法
兩組對邊相等的四邊形
三位數除以一位數（二）
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題 5
Quiz on Projection of a Line Segment on a Plane 投影：測驗
正四角錐
格子點
三角函数求值 （单位圆、比值）
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Polygons
Distributions
Tree Diagrams
Numbers
Limits