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光的反射
Author:
JUNWAYLIANG
A,B兩點在直線L同側, 在L上找一點P使得由A點出發的光線, 會經由L上反射至B點(等價命題為:在直線L上找一點P, 使得AP+PB有最小值)
GeoGebra
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三位數除以一位數(一)
柱體建築師
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找出對稱軸
sanjiaohanshu
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八年级奥数之双曲线
極限不存在(雙路徑法)
不規則填色
gjh-g03-01 和的平方公式
"拈" 類遊戲之一-搶21遊戲 The 21 game
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Distributions
Addition
Circumcircle or Circumscribed Circle
Cylinder
Normal Distribution