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補角關係
Author:
藍邦偉 Blue
GeoGebra
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異分母分數減法
三位數除以一位數（二）
【案例】2018年全国1卷理科12题
画直线等分三角形的面积
兩組對邊相等的四邊形
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封閉著色2
分數認識
Geometry : Types of Angles (幾何：角的種類)
多位數乘法 三位數(max)與兩位數(max)相乘
Solve ax + b = cx + d
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Tree Diagrams
Random Variables
Natural Numbers
Interest Calculation
Secant Line or Secant