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随机三角形背景
Author:
孟宝兴
GeoGebra
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兩位數加法
算柱 (兩位數)
近似值：有效數字
拼砌四邊形
兩位數除以一位數（二）
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SIMPLE EQUATION
圓形,三角形軌跡觀察
面積與積分值
題五
Copy of Triangular Number
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Distributions
Trigonometry
Fractions
Addition
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