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符成岗
GeoGebra
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【案例】2013年安徽高考15题
【案例】2018年全国1卷理科12题
直線的斜率:水平變化 & 鉛垂變化
球体的体积推导(优化版)
三角函数 的副本
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test
駐波:相向而行的兩行進波線性疊加而成
DSE Circle-ACT03C Relationship Between Arcs and Angles at Circumference
正四面體反射面
数学试卷难点解题思路
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Ratios
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Pythagoras or Pythagorean Theorem
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