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S8G5 消失的小方格
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学用数学
GeoGebra
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第八周作业
画直线等分三角形的面积
【案例】圆柱体内放置一个大球六个小球
球体的体积推导（优化版）
球体的体积推导
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正三角形尺规作图
分數與小數
How to reconstruct a quadrilateral farm to a triangular one with the same area?
生活中的平面圖形─多邊形的性質
巴拉拉能量3.0
Discover Topics
Trigonometry
Optimization Problems
Integers
Geometry
Quadrilaterals