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最小周長三角形
Author:
学用数学
GeoGebra
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兩組對邊相等和有直角的四邊形
找出對稱軸
異分母分數減法
兩位數除以一位數（一）
算柱 (兩位數)
Discover Resources
Area of Triangle_1
觀察軌跡
S2 ch2.3 simultaneous equation
錐體體積圖解
二元线性规划的图解法(18.2 例4)
Discover Topics
Set Theory
Distributions
Complex Numbers
Sine
Median Line