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5分** 1 條Form 2 數,, 入黎睇下啦...

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20 分** 1 條Form 2 數,, 入黎睇下啦... 1 條Form 2 數... http://img12.picsplace.to/img.php?file=img12/2/Maths_2_000.jpg 答案係... 434/km 唔該講下點解... 最好有埋解釋... 最好果個會係最佳回答... thx~

最佳解答:

The question is "it is given that the world population in 2005 was 6.47 x 10^9, and 1.49 x 10^8 km^2 of the area of the Warth is land. Suppose people on the Earth live on 10% of the land, find the average population density(poplulation/km^2)of the world" 全球陸地共有1.49 x 10^8 km^2 其中只有10%的有人居住,,所以係1.49 x 10^8 *10%=1.49 x 10^7 km^2 所以,平均每km^2有(6.47 10^9)/(1.49 x 10^7)人住 即係434.2281879=>434 population/km^2

其他解答:

thx|||||It is given that the world population in 2005 was 6.47 x 10^9, and 1.49 x 10^8 km^2 of the area of the Earth is land. Suppose people on the Earth live on 10% of the land, find the average population density (poplulation/km^2) of the world.(Give your answer correct to 3 s.f.) 首先搵左10% of the land (住人既地土面積) (1.49x10^8) x 10%=14900000=1.49x10^7 then the average population density =(world population) / (10% of the land) =(6.47 x 10^9) / (1.49x10^7) =434.228188 =434 poplulation/km^2 (cor to 3 s.f.) 2007-04-25 19:44:57 補充： 補充the average population density因為你要搵poplulation/km^2重點係per km^2所以要(world population) / (10% of the land)

 

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