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dhc987
GeoGebra
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圓周公式的應用
兩位數除以一位數（二）
三位數除以一位數（一）
祖冲之的期望：内棋与外棋
漂亮的摇摆曲线
Discover Resources
任務1
題四
Sierpinski Triangle
string art
Doppler Effect and Shockwave
Discover Topics
Vectors 2D (Two-Dimensional)
Equilateral Triangles
Perimeter
Linear Regression
LCM and GCD