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20200417平面直角坐标系复习T14（2）
Author:
陈敦莹
GeoGebra
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多邊形的面積
平行線的斜率
【案例】2018年全国1卷理科12题
画直线等分三角形的面积
漂亮的摇摆曲线
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tube15240
畢氏定理拼圖007(8片)
勾股定理
扇形面積公式1
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Optimization Problems
Prism
General Quadrilateral
Fractions
Trigonometric Functions