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Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決
Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決 
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國一數學 質數
Oct 27th 2013, 16:41

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解： 900 ＝ 2 × 2 × 3 × 3 × 5 × 5 質因數為 2 、 3 、 5 不大於 900 ，與 900 互質的數有 900 × (1-1/2) × (1 － 1/3) × (1 － 1/5) ＝ 900 × (1/2) × (2/3) × (4/5) ＝ 900 × (4/15) ＝ 240 個...
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