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垂心問題
Author:
連琨銘
GeoGebra
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三位數除以一位數（二）
兩位數除以一位數（一）
【案例】2018年全国1卷理科12题
sanjiaohanshu
兩組對邊相等和有直角的四邊形
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Square Root 平方根
Number of solutions of two straight lines
∆ABD 面積 = ?
以 Unit Circle 了解 Sine 的正/負的副本
cos, sin 與單位圓
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Derivative
Scatter Plot
Orthocenter
Normal Distribution