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三角形的外心
Author:
侯杰材
GeoGebra
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兩位數除以一位數（二）
兩位數除以一位數（一）
異分母分數減法
柱體建築師
找出對稱軸
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音樂會的入場人數
角度
百分數：折扣 / 賺賠
一次因式檢驗法(2020新版)
Discover Topics
Rectangle
Continuity
Matrices
Statistics
Multiplication