备考必备：ACT数学真题解析三则

　　各位小伙伴有很多都在备考ACT考试，大家都认为ACT数学对于同学们来说是比较容易拿分的一项，不难，可事实真的是这样吗？其实不然，每次ACT考试只有一小部分人可拿到高分，其他人都只是刚刚过线，这是为什么呢？是因为他们平时对ACT数学太过轻视，备考时没有好好复习，所以在备考时，要多做ACT数学练习题。那么今天小编就给大家整理一些ACT数学真题解析，一起来看看吧。

　　1. If a? = 12, then a4 =

　　A. 144

　　B. 72

　　C. 36

　　D. 24

　　E. 16

　　Correct Answer: A

　　解析:

　　a4 = a2 x a2 = 12 x 12 = 144

　　2. If n is even, which of the following cannot be odd?

　　I n + 3

　　II 3n

　　III n? - 1

　　A. I only

　　B. II only

　　C. III only

　　D. I and II only

　　E. I, II and III

　　Correct Answer: B

　　解析:

　　In case I , even plus odd will give odd. In case II, odd times even will give even. In case III even squared is even, and even minus odd is odd. (You can check this by using an easy even number like 2 in place of n). Only case II cannot be odd.

　　3. One side of a triangle has length 8 and a second side has length 5. Which of the following could be the area of the triangle?

　　I 24

　　II 20

　　III 5

　　A. I only

　　B. II only

　　C. III only

　　D. II and III only

　　E. I, II and III

　　Correct Answer: D

　　解析:

　　The maximum area of the triangle will come when the given sides are placed at right angles. If we take 8 as the base and 5 as the height the area = ? x 8 x 5 = 20. We can alter the angle between the sides to make it less or more than 90, but this will only reduce the area. (Draw it out for yourself). Hence the area can be anything less than or equal to 20.

　　以上就是关于ACT数学的分享，希望大家在平时可以多加练习，想了解更多关于ACT真题解析下载的内容，多多关注本网站，也可以添加微信号kewo11。