请求高手帮助!题目都看不懂！

fengzhecool

题目是这样的

    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 closet to the percent change in the concentration of chemical A required to keep the reaction rate unchanged?

the right answer is "40% increase"

题目怎么读都不知道在说什么。请高手指点！

ecsniffers

up,ding !!!!!!

bmp3

原题是说：
    x·x+y 能够称反应式
现在y用量变成2倍，要求反应式比例不变。
即： 2X·X+2y
所以x用量为根号2倍X，与原先用量x相比则是： 根号2-1=1.414-1=40%

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shawlen

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