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椭圆的光学性质
Author:
孟宝兴
GeoGebra
New Resources
拼砌四邊形
四邊形的特性
判斷球體
畫出對稱圖形
兩位數除以一位數（二）
Discover Resources
龍騰4_1-1課例3
Graph of Cosine Function 餘弦方程圖像
尺規作圖平分一個角
熱帶魚 (顏色變更)楊靜宜
算柱 (兩位數)
Discover Topics
Triangles
Reflection
Upper and Lower Sum or Riemann Sum
Coordinates
Algebra