i choose B
rate = p * A^2 / B, p is a constant.
B is doubled, and A is remain constant. So rate is 50% decreased.
题目问的好像不是这个吧。
问题是:在保持Rate不变的情况下,A该如何变化?
B Double了,A'^2=2A => A'=1.41A (2开根号)=>A'增加了接近40%
举报
发表回复
手机版|ChaseDream|GMT+8, 2024-5-12 21:21 京公网安备11010202008513号 京ICP证101109号 京ICP备12012021号
ChaseDream 论坛
© 2003-2023 ChaseDream.com. All Rights Reserved.