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try_111
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try_1
GeoGebra
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畫出對稱圖形
兩組對邊相等和有直角的四邊形
GeoGebra笔记功能体验课件
錐體建築師
【案例】2018年全国1卷理科12题
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Clock
線性規劃
三角比的性質
拋物線：切線與弦中點
對稱成分(零序.正序.負序)
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Statistics
Statistical Characteristics
Derivative
Subtraction
Secant Line or Secant