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GGB4
Author:
王博賢
GeoGebra
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四邉形 (四年級) 教師版
画直线等分三角形的面积
判斷球體
兩位數除以一位數（二）
算柱 (兩位數)
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五邊形與三角形等積
Number of solutions of two straight lines
三棱柱
Problem1:(md+me+mf)/(ad+be+cf)=a
金惠吉：正弦交流电演示
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Unit Circle
Means
Special Points
Scalene Triangles
Orthocenter