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20190530 與平行線有關的角
Author:
Hui Sir
GeoGebra
New Resources
第八周作业
算柱 (兩位數)
拼砌四邊形
兩位數加法
三位數除以一位數（二）
Discover Resources
Making Graph paper
圓外冪問題
ycps4a1
Spiral Polyskelion
雙曲線1 焦點法
Discover Topics
Scalene Triangles
Quadratic Equations
Arithmetic Operations
Area
Differential Calculus