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學習單：三角形面積
Author:
Tsai, Dung Jung
,
harryau
GeoGebra
New Resources
近似值：有效數字
三位數除以一位數（一）
四邉形 (四年級) 教師版
第八周作业
畫出對稱圖形
Discover Resources
分數加法和減法
Klein Bottle
夜市麻將模擬機
半圓柱(可改底面圓半徑、柱高)
Graph of Trigonometry
Discover Topics
Reflection
Geometry
Logic
Logarithmic Functions
Perimeter