下面是2012年12月11日的SAT官方每日一题的内容，是关于数学方面的，题型是选择。SAT官方每日一题是collegeboard每天都会发布的题目，关于SAT考试的三个部分的各个题型。下面我们就一起来看一下这个SAT官方每日一题吧。

　　SAT官方每日一题之数学---选择：

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　　Read the following SAT test question and then click on a button to select your answer.

　　,,, andare points on a line, withthe midpoint of segment. The lengths of segments,, andare,, and, respectively. What is the length of segment?

　　Mathematics > Standard Multiple Choice

　　(A)

　　(B)

　　(C)

　　(D)

　　(E)

　　The correct answer is B

　　Explanation

　　The key to this question lies in not jumping to incorrect conclusions. The question names the points on a line. It gives you a variety of information about the points. The one thing it does not do is tell you the order in which the points fall.

　　Many students assume that the order of the points is, then, then, then.As you will see, if you try to locate the points in this order, you will be unable to answer the question.

　　What Is the Question Asking?

　　The question asks for the length of line segment. In order to find this length, you have to establish the relative positions of the four points on the line.

　　What Do You Know?

　　Try to draw the figure. You might be tempted to locate pointfirst. Unfortunately, you don&apost have enough information about, yet, to place it.

　　You can place,, andbecauseis the midpoint of.

　　You know the lengths of three of the line segments:

　　Because you know whereis, you can label the length of.

　　Build the Figure, Adding What You Know and What You Can Figure Out

　　Becauseis the midpoint of, you know thatandare eachunits long.

　　Where can you place point?

　　It has to beunits from, because.

　　It also has to beunits from, because.

　　So the only location foris betweenand, but closer to.

　　Place pointand mark the distances.

　　It is now an easy matter to figure out the answer to the question:

　　isunits.

　　isunits closer tothan, soisunits.

　　以上就是关于2012年12月11日SAT官方每日一题中数学部分的详细内容，包括了题目和选项以及答案，后面附有一道相关的练习题。大家可以在备考SAT的过程中关注SAT每日一题的内容，这样就可以更好有不间断的练习，也就能在日积月累的过程中得到提高。

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