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平行线
Author:
数豆豆
GeoGebra
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第三周作业效果演示
直線的斜率：水平變化 & 鉛垂變化
平行線的判定
斐波那契螺旋弧线（表格法-可动态调节）
双心四边形
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乘法
銀杏葉
P4周界
Sphere[O, r]
基础知识
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Congruence
Quadratic Functions
Statistics
Arithmetic
Arithmetic Operations