耗子数学


耗子数学很强,见了加减乘除就开心,听到1234就来劲。

熊咬随口读了一下环境科学课本里的一段话,耗子数学神经顿时兴奋起来。

“The most densely populated place in the world is Macau, a Chinese Special Administrative Region, with 21,346 people per square kilometers (8,239 people per square miles). The least dense is Greenland.

Bangladesh’s population density is up to 1,127 per square kilometers (435 per square miles) in an area the size of Iowa.”

耗子脑袋一想,眼睛一转,说,“不对,第一个数字换成people per square mile应该是五万多,第二个也算得不对。”

熊咬上网一查换算公式,果然!1km² = 0.38610mi²

那如果1km² 有21346人,1mi²应该有1/0.3861*21346=55286人

第二个数字应该是1/0.3861*1127=2919人

唉,如果狗熊有耗子大脑就好了。。。

 

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3 条 耗子数学 的回复

  1. dd说道:

    1127 persons/km^2 = 1127 persons / (mi^2/0.3861) = 1127*0.3861 persons / mi^2 = 435/mi^2
    其实教科书没错。。。。

  2. Hao说道:

    🙂 well, I once had 1/2+1/2 = 1/4 in an exam….

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