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双曲线的聚光效果
Author:
东海1号
Topic:
Conic Sections
GeoGebra
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兩組對邊相等的四邊形
三位數除以一位數（二）
判斷球體
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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Conic section
Ex5D#7
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旋轉體：8y² = x²(1 - x²)
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Pyramid
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Root