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二次函数1
Author:
陈铁成
GeoGebra
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双心四边形
盈利與虧蝕
撒针估算面积实验
直線的斜率：水平變化 & 鉛垂變化
第三周作业效果演示
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glt-c02-09 五角柱旋轉
Congruent and Similarity
验证2
一次函数图象及性质
Copy of 賺賠：例1
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Trigonometry
Orthocenter
Area
Rhombus
Sequences and Series