2006 mc (14)
It is given that x varies directly as y and inversely as z^2 . If y is decreased by 10%
and z is increased by 20%, then x is decreased by
A.10%
B 23.6%
C 25%
D 37.5%
variations 問題
2007-04-17 11:27 pm
回答 (1)
2007-04-18 1:27 am
✔ 最佳答案
Ans: [D]Originally,
x=ky/z^2, where k is a constant
When there are changes,
x=k(0.9y)/(1.2z)^2
∵0.9/(1.2)^2 = 0.9/1.44 = 0.675
1-0.675 = 0.375
∴ Ans.: [D]
希望你睇得明我打咩啦~
收錄日期: 2021-04-18 21:53:50
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20070417000051KK01825