Q36:
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*10^9
B. 4.1*10^9
C. 1.9*10^10
D. 2.5*10^11
E. 4.1*10^11
Answer: B
請教思路...感謝
1.3 1017 seconds
对不起,请问这中间空格什么意思啊:)
不好意思..題目上的分別是 1.3*10^17 3.2*10^7
一岁= 3.2*10^7,地球有1.3*10^17,那么地球有多少岁呢?(通俗点的比方,说得不对,见谅:))
当然是 1.3*10^17 除以 3.2*10^7 =1.3/3.2*10^10=13/3.2*10^9 = 4.06*10^9,=B
很謝謝你...真的是看暈了@!
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