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过圆上一点作切线，三步
Author:
u.jianwang
GeoGebra
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兩組對邊相等的四邊形
畫出對稱圖形
【案例】2013年安徽高考15题
異分母分數減法
画直线等分三角形的面积
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老師~這樣算另一種嗎??
鋪地磚(六邊形)
圓內接四邊形任務二
zentangle
Drag C and see
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Area
Linear Regression
Sine
Diagrams
Exponential Functions