December 14, 2010

好多的盒子

有一個超級大的盒子 裡面有五個大盒子   每個大盒子裡又有五個中盒子    每個中盒子裡又有五個小盒子    每個小盒子裡又有五個超小盒子   總共有幾個盒子??

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Personal Category: Uncategorized Articles Topic: learning / academic / mathematics
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