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答重庆杨志友椭圆的定义
Author:
单晨
GeoGebra
New Resources
拼砌四邊形
三位數除以一位數（一）
【案例】圆柱体内放置一个大球六个小球
畫出對稱圖形
算柱 (兩位數)
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三角形的高與面積
S1 Ex9.2 Q17
congruent (SSS) 2
x²+y²+z²的取值范围
C60足球模型展开（双色版）
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Mathematics
Histogram
Tangent Line or Tangent
Circle
Geometric Mean