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20180412 同分母分數加法
Author:
makkei
GeoGebra
New Resources
找出對稱軸
拼砌四邊形
異分母分數減法
三位數除以一位數（一）
算柱 (兩位數)
Discover Resources
GGB動畫-會有圖案
正弦函數值的變化
截平面
Chords of a Circle
Pyth. theorem
Discover Topics
Geometry
Statistics
Curve Sketching
Probability
Functions