The rate of a certain chemical reaction is directly proportional to the square of the concentration of chemical A present and inversely proportional to the concentration of chemical B present. If the concentration of chemical B is increased by 100 percent, which of the following is closest to the percent change in the concentration of chemical A required to keep the reaction rate unchanged? (A) 100% decrease (B) 50% decrease (C) 40% decrease (D) 40% increase (E) 50% increase 由题目可知 反应速率与A浓度的平方成正比，与B浓度的一次方成反比 可是当B增加 100% 增增加多少 这是要怎麽列式+运算? 里面 有大大提到 "反应速率~{[A]^2}/[B] 当[B]增加100% 则[A]需增加(√2-1)" 想请问 "(√2-1)" 怎麽来的? 小的比较笨 有劳各位大大教导了 也先谢过了 --

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