math f.1

👨🏻‍🏫 學術台數學

ddobtn

2008-05-28 5:34 am

Find three concutive number such that the sum of 3 times the greatest number

and 2 times the smallest number is 81.

點解＆點做

要用方程

更新1:

要ｌｅｔ　ｘ　ｂｅ　ｔｈｅ　ｓｍａｌｌｅｓｔ　ｎｕｍｂｅｒ　．

更新2:

ｗｈｙ　不ｎｅｅｄ　ｔｏ　求 x+1

回答 (1)

用戶79088

2008-05-28 5:38 am

✔ 最佳答案

let the largest one be x.
then the second one is x-1.
the smallest one is x-2.

3x+2(x-2)=81
3x+2x-4=81
5x=81+4
5x=85
x=17

參考: ME

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