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时之殇
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畫出對稱圖形
拼砌四邊形
兩組對邊相等和有直角的四邊形
兩位數加法
找出對稱軸
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地球儀5
gct-c01-jc094v1-33 圓與長方形
angles sum of a triangle 1
p11-11
擲兩個硬幣的機率分布的副本
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Integral Calculus
Rational Numbers
Linear Regression
Pythagoras or Pythagorean Theorem
Intersection