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一线三等角相似模型
Author:
张老师
GeoGebra
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撒针估算面积实验
龙形曲线-分形龙2
折扣
第八周作业2
双心四边形
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chap. 1 by ck
兩圓的公切線
函數的面積 (黎曼和)的副本
橢圓(左右型)標準式
"拈" 類遊戲之一-搶21遊戲 The 21 game
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Inequalities
Angles
Reflection
Ellipse
Sequences and Series