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工具：PlaneArrows, PlaneText... (v.2)
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
New Resources
直角坐標平面上的旋轉變換
算柱 (兩位數)
兩位數加法
四邉形 (四年級) 教師版
三位數除以一位數（二）
Discover Resources
ibooks-函數的平移
複合形體的表面積(凸形)
轴对称
題二
Trigonometric Relations(90,270)
Discover Topics
Interest Calculation
Set Theory
Trapezoid
Arithmetic Operations
Upper and Lower Sum or Riemann Sum