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先估算，後看解釋
Author:
Tse Sir
先估算，後看解釋
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異分母分數減法
兩組對邊相等的四邊形
兩組對邊相等和有直角的四邊形
兩位數除以一位數（二）
【案例】2013年安徽高考15题
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简易立体几何
Box method for multiplication
testing book
anlge at centre twice angle at circumference
数学涂鸦
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Rotation
Natural Numbers
Continuity
Ellipse
Expected Value