推 sandisk:哦哦哦 懂了懂了 感謝 09/19 14:35
※ 引述《sandisk (.)》之銘言：
: A certain quantity is measured on two different scales, the R-scale and the
: S-scale, that are related linearly. Measurements on the R-scale of 6 and 24
: correspond to measurements on the S-scale of 30 and 60, respectively. What
: measurement on the R-scale corresponds to a measurement of 100 on the S-scale?
: A. 20
: B. 36
: C. 48
: D. 60
: E. 84
: Answer: C
: 有人可以告訴我這題是在幹嘛嗎??
: 我都看不懂
: 我會非常感激的
你可以先用溫度計華氏和攝氏轉換的觀念來看 應該就懂了吧
題目有說是線性相關 R規 6 = S規 30; R規 24 = S規 60
令R=X, S=Y
6a+b=30
24a+b=60 兩式解聯立
得a=5/3, b=20
=> 5/3X+20=Y , Y=100
=> X=48...
參考看看吧
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