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凸透鏡的成像（理想）
Author:
joeyliaw.tw
GeoGebra
New Resources
兩組對邊相等和有直角的四邊形
拼砌四邊形
画直线等分三角形的面积
判斷球體
球體建築師
Discover Resources
Apollonius Problem gergonne 1
Single Line Deflection
硬幣換算小遊戲
复数的模 计算 自动批改
诱导公式三（x轴对称关系）
Discover Topics
Matrices
Pythagoras or Pythagorean Theorem
Arithmetic Operations
Planes
Variance