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标题: GWD1-23 [打印本页]

作者: kjhggsdf 时间: 2006-12-21 07:12 标题: GWD1-23

Q23:

The age of the Earth is approximately 1.3 10¹⁷ seconds, and one year is approximately 3.2 10⁷ seconds. Which of the following is closest to the age of the Earth in years?

A. 2.5 10⁹

B. 4.1 10⁹

C. 1.9 10¹⁰

D. 2.5 10¹¹

E. 4.1 10¹¹

^{贴不完整,中间是乘号,我觉得是4.1*10的20次方,晕倒}

作者: peiyangzhe 时间: 2006-12-21 20:51

anyway, share the answar to everyone

(4.1*10^9)(3.2*10^7)=13.12*10^16=1.312*10^17 about 1.3*10^17

so the answar is B

作者: shuishuiles 时间: 2006-12-23 19:01

题目不理解！看不懂，谁能解释一下~~谢谢哦……

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