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1986全国理2
Author:
常振虎
GeoGebra
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畫出對稱圖形
拼砌四邊形
球體建築師
兩組對邊相等和有直角的四邊形
三位數除以一位數（二）
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函數與反函數的導數關係
減法
graph of y=-f(-(x-1))
Angle in alt.segment
加法(10一數的副本
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Parametric Curves
Trigonometric Functions
Continuity
Cube
Trigonometry