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标题: one math problem. thx [打印本页]

作者: alexmingzhu 时间: 2006-10-4 08:09 标题: one math problem. thx

A sequence of numbers is 1/2, 1/4, 1/8, 1/16, 1/32, what is the range of the tenth number a₁₀in the sequence?

(Key: 0.0001<a₁₀<0.001)

please tell me how to work it out, thank you very much.

作者: stevegt 时间: 2006-10-6 06:26

a_{10= 1/1024 这个记住就行了}

_{不是每道题目非要正儿八经推出来，有时候技巧也重要。}

作者: robert 时间: 2006-10-6 10:31

0.001=1/(2×5)³

0.0001=1/(2×5)⁴

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