mathz!急! 1 question only!
2008-01-06 12:48 am
A man weighing 145.8 kg has undergone a treatment which claims to reduce his weight by 10% every 8 months of his weight at the beginning of that period.What was his weight 2 years ago?
回答 (2)
2008-01-06 12:58 am
✔ 最佳答案
Let x kg be his weight 2 years ago,x(1-10%)^3=145.8 <---2years=3x8months
x (0.9)^3=145.8
x=200
So, his weight 2 years ago=200kg
參考: me
2008-01-06 5:22 am
let his weight 2 years ago be x.
x(1-10%)^3=145.8
x(0.9^3)=145.8
x=145.8/0.729
x=200
so his weight 2 years ago is 200kg
x(1-10%)^3=145.8
x(0.9^3)=145.8
x=145.8/0.729
x=200
so his weight 2 years ago is 200kg
參考: me
收錄日期: 2021-04-13 14:52:44
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080105000051KK02802