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費氏 的副本
Author:
xiaoqing xia
GeoGebra
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【案例】2018年全国1卷理科12题
畫出對稱圖形
錐體建築師
近似值：有效數字
四邊形的特性
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長方形與正方形的面積
三角形與邊上一點求正三角形
正四面體對邊向量垂直作圖證明
star
廣義三角：tan
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Plane Figures or Shapes
Vectors
Quadratic Functions
Means
Polygons