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椭圆画法2定义法
Author:
冯伟冀
GeoGebra
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四邊形的特性
兩位數除以一位數（一）
拼砌四邊形
判斷球體
兩組對邊相等的四邊形
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量度活動所用的時間 (時、分)
圓與三角形
Pyramid and Cone 2
立體函數圖形
基础知识
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Normal Distribution
Reflection
Integral Calculus
Parallelogram
Sequences and Series