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S1E2 jastrow illusion
Author:
学用数学
,
acchu
GeoGebra
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異分母分數減法
判斷球體
三位數除以一位數（一）
算柱 (兩位數)
兩組對邊相等的四邊形
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Hypocycloid Wheel
數學繪圖
雙曲線1--焦點法
柱體建築師 1 的複本
【案例】2013年安徽高考15题
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Numbers
Circumcircle or Circumscribed Circle
Difference and Slope
Rotation
Sequences and Series