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111mathA
Author:
Wu Xiao-Ren
GeoGebra
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直角坐標平面上的旋轉變換
【案例】2018年全国1卷理科12题
兩組對邊相等和有直角的四邊形
近似值：有效數字
判斷球體
Discover Resources
五上_面積（二）
test1
製作對稱圖形 level 3
Graph of Cosine
数矩形个数
Discover Topics
Real Numbers
Quadrilaterals
Centroid or Barycenter
Sphere
Rectangle