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1982全国理4
Author:
常振虎
GeoGebra
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兩組對邊相等的四邊形
兩位數除以一位數（二）
畫出對稱圖形
兩組對邊相等和有直角的四邊形
【案例】2013年安徽高考15题
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Add and subtract (binary) 2
大字體
歪斜線
比較角的大小一
玖数小学数学（思维拓展）
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Real Numbers
Linear Programming or Linear Optimization
Sphere
Line Segment
Optimization Problems