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三角形內角和為180度
Author:
范欣茹
GeoGebra
New Resources
第八周作业
四邊形的特性
畫出對稱圖形
異分母分數減法
兩組對邊相等和有直角的四邊形
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費氏螺旋 (試算表)
http://www.qsir.org/?p=8853
Question 9
碎形
维纳斯的身高 （简易版）
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Multiplication
Trigonometry
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