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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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兩位數除以一位數（二）
sanjiaohanshu
兩組對邊相等和有直角的四邊形
第八周作业
異分母分數減法
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複數
waaachen
阿基米德(3,10,10)
Equal chords and their distances from the centre
畢式定理 (13)
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Continuity
Probability
Dilation
Differential Calculus
Pyramid