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圓相切
Author:
一路梁
圓相切
GeoGebra
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兩位數加法
球体的体积推导
球体的体积推导（优化版）
異分母分數減法
三位數除以一位數（一）
Discover Resources
引擎的行程
旋轉一物件
塗鴉
test
modulus and argument of z
Discover Topics
Rectangle
Linear Functions
Scalene Triangles
Root
Arithmetic Operations