Form 1 Maths
2009-02-26 3:20 am
It is given that the thickness of a stack of 500 sheets of graph paper is x cm and the thickness of a stack of 20 sheets of the same graph paper is y cm. Find the thickness of a sheet of graph paper as accurate as possible.
回答 (2)
2009-02-26 6:31 am
✔ 最佳答案
Thickness of a sheet of graph paper = (x/500) cm解釋：
有兩個方法計每張紙的厚度，一個係 (x/500)，另一個係 (y/20)。
兩個 denominators 都係準確數字，而 numerator 數愈大，percentage error 愈細。例如 500 張紙厚 5 cm，20 張紙厚0.2 cm，你用尺的 error 是 +0.1 cm。所以 5 cm 會度成 5.1 cm，0.2 cm 會度成 0.3 cm，數字大個 percentage 會細好多。好明顯 x >> y，所以 x/500 較 accurate。
2009-02-26 6:04 am
題目要求 as accurate as possible，所以應用
500
----- cm
x
來求 the thickness of a sheet 較準確
2009-02-25 23:17:21 補充：
sorry, answer should be
x
---- cm
500
500
----- cm
x
來求 the thickness of a sheet 較準確
2009-02-25 23:17:21 補充：
sorry, answer should be
x
---- cm
500
參考: 剛剛TSA練習做過
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