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【OG20-P171-161题】
What is the smallest integer n for which 25n>512 ?
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当前版本由
感觉自己萌萌哒 更新于2015-11-27 15:06:19 感谢由
感觉自己萌萌哒 对此题目的解答所做出的贡献。
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=》2N>12
N>6
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bubbles
Because 52=25 , a common base is 5. Rewrite the left side with 5 as a base: 25n=(52)n=52n . It follows that the desired integer is the least integer n for which 52n>512 . This will be the least integer n for which 2n>12 , or the least integer n for which n>6 , which is 7. 正确答案选B,而不是A
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0 回复 2019-01-02 06:14:13