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Angle at Centre Twice Angle at Circumference

Author:Eric Chiu

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兩組對邊相等和有直角的四邊形
三位數除以一位數（一）
兩位數除以一位數（一）
画直线等分三角形的面积
【案例】2013年安徽高考15题

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正七邊形
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圖解最簡根式
圆锥侧面的展开

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