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正方形折纸减去两角
Author:
孟宝兴
GeoGebra
New Resources
四邉形 (四年級) 教師版
算柱 (兩位數)
拼砌四邊形
異分母分數減法
兩位數除以一位數（二）
Discover Resources
車線.ggb
百葉窗2
顶顶顶顶顶顶顶顶顶顶
面積的量度
三元大作戰-勾選版
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Boxplot
Quadrilaterals
Means
Cube
Pythagoras or Pythagorean Theorem