数学一道不知道怎么算的题目，请教。。

jackba8888 · 发表于 2011-11-16 13:23:10

The rate of a certain chemical reaction is directly proportional to the square of the concertration of chemical A present and inversely proportional to the concentration of chemical B present. If the concentration of chemical B is increased by 100 precent, which of following is closest to the percent change in the concentration of chemical A required to keep the reaction rate unchanged?
1. 100% decrease
2. 50% decrease
3. 40% decrease
4. 40% increase
5. 50% increase

vyc · 发表于 2011-11-16 13:59:35

R=A^2/B=?^2/2B
求出？= √2 *A=1.414A
所以，A 大约增加40%

jackba8888 · 发表于 2011-11-16 16:24:49

恍然大悟，谢谢。

数学一道不知道怎么算的题目，请教。。

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