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解涉及同類項的簡易方程（練習）
Author:
maths.ephhk
GeoGebra
New Resources
兩位數加法
拼砌四邊形
兩組對邊相等的四邊形
三位數除以一位數（一）
球体的体积推导（优化版）
Discover Resources
Polygon incised
五邊形中點
Angle at Centre Twice Angle at Circumference
指數函數的圖形
美麗的地球
Discover Topics
Difference and Slope
Diagrams
Translation
Straight Lines
Vectors