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二次函数y=ax²（a＞0)
Author:
吕胜
GeoGebra
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四邊形的特性
【案例】2013年安徽高考15题
兩位數除以一位數（一）
球體建築師
錐體建築師
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橢圓
橢圓軌跡加滑桿
圓錐曲線
loci car
纏繞畫1
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Arithmetic Mean
Arithmetic Operations
Combinatorics
Perimeter
Natural Numbers