请教数学~~prep上的

小纾

1.The rate of a certain chemical reaction is directly proportional to the square of chemical A present and inversely proportional to the concertration of chemical B present. If the concertion of chemical B is increased by 100 percent, which of the following is closest to the percent change in the concerntraton of chemical A required to keep the reaction rate an change? a.100%increase b.50%decrease c.40%decrease d.40%increase e.50%increase   答案d
难道是化学题? 完全没有明白他再什么?

A set of 15difffenent integers has a median of 25 and a range of 25 最有可能的数是几? 32,37,40,43,50 答案43
为什么?怎么算的?

上官

帮顶~同样没明白这道题在讲什么~

flyingbunny

1。 化学反应跟a的平方成正比，跟b成反比
2。Set of different integers
18,19,20,21,22,23,24,25
18+25=43

lxx1102

帮顶，同样不懂。。。另外楼上第二题那一串数的中数不是25啊，而且RANGE不是值域的意思吗？费解中。。。

ejason

LZ的第二题，请小心题干中的“DIFFERENT”