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1988全国文4
Author:
常振虎
GeoGebra
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【案例】2013年安徽高考15题
兩位數加法
球體建築師
兩位數除以一位數（二）
兩組對邊相等的四邊形
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圓環扇形
呵呵
正12面體
二面角
Sunrays with different angles
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Functions
Fractions
Distributions
Differential Equation
Parallelogram