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直线与平面垂直的折纸实验
Author:
孟宝兴
GeoGebra
New Resources
兩位數除以一位數（一）
兩組對邊相等和有直角的四邊形
【案例】2013年安徽高考15题
兩組對邊相等的四邊形
球體建築師
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翰林B4講p171_類8
角的大小與角兩臂的長度有關？
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Size, Shape, Orientation
两角和的正切公式几何证明
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Tree Diagrams
Addition
Linear Equations
Random Experiments
Trigonometry