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平行四邊形之變奏I
Author:
周桂名
Topic:
Parallelogram
拉動一下C、D兩點，觀察一下！
GeoGebra
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近似值：有效數字
【案例】2018年全国1卷理科12题
畫出對稱圖形
兩位數除以一位數（一）
三位數除以一位數（二）
Discover Resources
P6 Maths
Sangaku
pentagon
时钟 的副本
Completing the Square (Part 3)
Discover Topics
Angles
Similar Triangles
Limits
Division
Inequalities