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比較角的大小2

Author:cheukyiu813

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撒针估算面积实验
圓的基本性質
常见四边形是否是双心四边形
直線的斜率
双心四边形

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對稱求最小
y=a(x-h)²+k
追击问题
三角函數名稱的由來
太陽系的奧秘

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