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18以內加法練習
Author:
Tong Wing Hong
GeoGebra
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随机三角形背景
繪畫長方形
小学一年级上（人教版）
勒洛四面体（拼接法）
HCF 和 LCM 的應用
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Locus 軌跡(1T)
Travel Graph 行程圖
HOMEWORK
均分除法（整數÷整數）
equations of circle 2
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Calculus
Functions
Dilation
Trigonometric Functions
Polynomial Functions