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行進波
Author:
ipc Wang
y=sin(3x-2t)
GeoGebra
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兩組對邊相等和有直角的四邊形
拼砌四邊形
球体的体积推导
三位數除以一位數（二）
【案例】2013年安徽高考15题
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中線
圓錐截痕
Angle Sum of Triangle
切割正二十面體
分點與向量比
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Straight Lines
Rhombus
Volume
Complex Numbers
Multiplication