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waaachen
Author:
陳兪宏
硯吉老師幾何題
GeoGebra
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画直线等分三角形的面积
四邊形的特性
判斷球體
算柱 (兩位數)
兩位數除以一位數（二）
Discover Resources
乘法公式2
和差角公式几何证明
圆锥曲线包络
ie 5
Archimedean spiral
Discover Topics
Trigonometry
Pie Chart or Circle Chart
General Quadrilateral
Rhombus
Probability