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3.2.2 实践（2）在椭圆中绘制定长的动弦
Author:
Zhang Guangmin
GeoGebra
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三位數除以一位數（二）
兩位數除以一位數（一）
畫出對稱圖形
異分母分數減法
錐體建築師
Discover Resources
根號n的做圖法之二
test1
橢圓1--同心圓法
sin(x) 的函數圖形 的複本
微分量 (Differentials)
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Subtraction
LCM and GCD
Standard Deviation
Numbers
Pie Chart or Circle Chart