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过圆上一点作切线，三步
Author:
u.jianwang
GeoGebra
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【案例】2018年全国1卷理科12题
四邊形的特性
球體建築師
異分母分數減法
畫出對稱圖形
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恒在线上的一点
數學模型
Quiz on Projection of a Line Segment on a Plane 投影：測驗
環環相扣
正角、負角|Positive angles & Negative angles
Discover Topics
Circle
Linear Programming or Linear Optimization
Percentages
Difference and Slope
Upper and Lower Sum or Riemann Sum