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三角形內角和180度
Author:
范欣茹
Topic:
Triangles
GeoGebra
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三位數除以一位數（二）
兩位數加法
兩位數除以一位數（二）
画直线等分三角形的面积
兩組對邊相等的四邊形
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梭哈的機率
Equations of Circles 圓方程
[問題] 線在面上
Number of solutions of two straight lines
两角差的余弦公式的证明
Discover Topics
Tangent Function
LCM and GCD
Reflection
Rational Numbers
Normal Distribution