【求助】prep又一道数学题

RayeRach · 发表于 2010-10-2 21:28:14

the rate of a certain chemical reaction is directly proportional to the square of the concentration of chemical A present and inversely proportioanal to the concentration of chemical B present. If the concentration of chemical B is increased by 100%,which of the following is closest to the percent change in the concentration of chemical A required to keep the reaction rate unchanged?
答案是40%increase

大伙儿帮忙给解答下吧，谢谢！

zinniz · 发表于 2010-10-2 22:07:31

the rate=A^2*(1/B)
=A'^2*[1/(1+100%)B]
A'=根号2*A
就是说增长了（根号2-1），约等于40%

RayeRach · 发表于 2010-10-3 08:40:49

谢谢zinniz！

【求助】prep又一道数学题

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