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分數加法
Author:
iedc
GeoGebra
New Resources
畫出對稱圖形
兩位數加法
異分母分數減法
三位數除以一位數（二）
兩組對邊相等和有直角的四邊形
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藝術
直線方程式--斜率比較
ghseh 二次函數描點法
Compare areas by cutting shapes Q1
第四次:20190308
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Distributions
Cone
Binomial Distribution
Unit Circle
Division