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橢圓之極偶 / polarity for ellipse
Author:
XIE Yuheng
GeoGebra
New Resources
算柱 (兩位數)
【案例】2013年安徽高考15题
第八周作业
畫出對稱圖形
兩位數除以一位數（二）
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MHschool
駐波:相向而行的兩行進波線性疊加而成
平面族
乘法公式
心脏线切线族
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Means
Variance
Statistical Characteristics
Rhombus
Root