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Author:王廷祐

Topic:Orthocenter

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柱體建築師
拼砌四邊形
判斷球體
異分母分數減法
三位數除以一位數（一）

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方格紙上畫長方形1
三節棍的軌跡
黃金三角形
Quiz on Solving Quadratic Inequalities 解二次不等式：測驗 (v2018)
伸縮矩陣的副本

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Piecewise Functions
Tree Diagrams
Vectors 2D (Two-Dimensional)
Variance
Set Theory

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