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等腰，角度关系
Author:
pjcfs
GeoGebra
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美國國旗 (Codex 版)
兩組對邊相等和有直角的四邊形
畫出對稱圖形
sanjiaohanshu
小数 的副本
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方格紙上畫平行四邊形2
ｔｏ郁捷
第一階段：二次函數恆正恆負條件，完成後往下至下一階段
求二次函数f(x)=-x^2+ax+3区间[-2,3]上的最大值
拋物線五-包絡線法
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Probability
Statistical Characteristics
Expected Value
Stochastic Process or Random Process
Inequalities