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Lttcmooc
GeoGebra
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兩組對邊相等的四邊形
判斷球體
画直线等分三角形的面积
兩組對邊相等和有直角的四邊形
三位數除以一位數（一）
Discover Resources
Area of Triangle_2
(1+x/n)^n 逼近 exp(x)
尋找等腰三角形 Isosceles Triangle Hunt
奔马
圆内弦（迭代）
Discover Topics
Reflection
Cube
Quadratic Equations
Subtraction
Geometric Mean