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过圆上一点作切线，三步
Author:
u.jianwang
GeoGebra
New Resources
球体的体积推导
祖冲之的期望：内棋与外棋
第八周作业
【案例】2018年全国1卷理科12题
【案例】圆柱体内放置一个大球六个小球
Discover Resources
電流急急棒棒
畫圖用底圖(含輔助格線)
教學媒體10/02
繡曲線02
閱讀鐘面及數字鐘（時和分）的副本
Discover Topics
Logarithmic Functions
Pythagoras or Pythagorean Theorem
Bar Chart or Bar Graph
Histogram
Logarithm