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托勒密定理推廣到任意四邊形二
Author:
連琨銘
GeoGebra
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三位數除以一位數（二）
兩組對邊相等和有直角的四邊形
第八周作业
拼砌四邊形
四邊形的特性
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一元二次不等式
題1
小圓內繞大圓
gjc093b19 梯形的面積
夹逼法确定无理数根号2的范围
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Isosceles Triangles
Set Theory
Ellipse
Similar Triangles
Quadratic Equations