# 2015年12月北美SAT机经+真题

2015-10-28 14:07 小马过河

为了帮助考生更好的备考12月份的SAT考试，今天小马过河的小编为各位考生推荐小马官网总结的2015年12月北美SAT机经+真题的内容，有需要的考生可以直接点击图片进行下载，下面我们一起来看一下吧。

2015年12月北美SAT机经+真题

1. Evaluate 3(4 - 2)2 -- 2.

A. -2

B. 10

C. 20

D. 34

E. 98

Explanation:

B. Use the acronym PEMDAS (see Chapter 12 if you don't remember what it means) to know that you need to deal with the parentheses first, and then the exponent. So, 3(4 - 2)2 - 2 = 3(2)2 - 2 = 3 × 4 - 2. Again, using PEMDAS, you need to do the multiplication before the -subtraction: 3 × 4 - 2 = 12 - 2 = 10.

2. Which of the following is true for the set of numbers 13, 19, 20, 20, 22, 29, 42, 63?

I.median = mode

II.mean > median

III.mode < mean

A. I only

B. II only

C. I and III

D. II and III

E. none of the above

Explanation:

D. The mode, if you remember, is the number that shows up most often, so in this case the mode is 20. The median is the middle number. Because there are two numbers in the middle, 20 and 22, the median is their average, or 21. Already you know that I is not true, so you can eliminate Choices (A) and (C). Now you need to determine the mean, also known as the average. To find the mean, add all the numbers together and divide by the number of numbers: (13 + 19 + 20 + 20 + 22 + 29 + 42 + 63) ÷ 8 = 228 ÷ 8 = 28.5. Now you know that II and III are both true, so the answer must be Choice D.

3. In triangle ABC, side AB is 12 units long and side BC is 15 units long. The length of side AC may not equal

A. 23

B. 24

C. 25

D. 26

E. 27

Explanation:

E. Triangle inequality! Remember that in any triangle, the sum of any two sides must be greater than the length of the third side. (See Chapter 16 to review this idea.) So, adding sides AB and BC, you get 27 units. The third side must be shorter than 27, so Choice (E) is the only answer that's impossible.

4. If |x + 2| = 3, then x is equal to

A. -5 only

B. 1 only

C. 1 and 5

D. 1 and -5

E. 5 and -5

Explanation:

D. Remember that the absolute value symbol turns everything inside into a positive number, so you know that x + 2 equals 3 or -3. Now you can solve both equations. The first equation, x + 2 = 3, results in x = 1, and the second, x + 2 = -3, results in x = -5. Choice (D) is the only option that includes both of these answers.

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