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Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決
Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決
比與比值 影長篇
Jul 5th 2013, 11:11

小明(a)和爸爸(b)的身高比是2:3，他們的身高合起來是300公分。在操場是同一時間測量到爸爸的影長是150公分。請問小明身高幾公分?小明的影長是幾公分?

2k+3k=300 => 5k=300

身高: k=60 => a=2*60=120(cm)........ans

b=60*3=180(cm)

影長: 150*2/3=100(cm).........ans


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