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waaachen0001

Author:陳兪宏

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三位數除以一位數（一）
兩組對邊相等的四邊形
【案例】2013年安徽高考15题
判斷球體
四邉形 (四年級) 教師版

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圓圓求切圓
winter vacation homework 8
先估算，後看解釋
三角函數角度轉換
利用对称求线段和最值（移动端）的副本

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Variance
Cube
Numbers
Parametric Curves
Conditional Probability

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