下面是2012年12月14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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　　Mathematics > Standard Multiple Choice

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

　　A geologist hasrocks of equal weight. Ifrocks and a-ounce weight balance on a scale withrocks and a-ounce weight, what is the weight, in ounces, of one of these rocks?

　　(A)

　　(B)

　　(C)

　　(D)

　　(E)

　　The correct answer is C

　　Explanation

　　Letequal the weight of each rock, in ounces. The weight on one side of the scale isounces and the weight on the other side isounces. Since the two weights balance, you can write the equation. Solving this equation yields.

　　下面是一道和SAT官方每日一题相似的题目，供大家练习：

　　Ifis the set of positive integers that are multiples of, and ifis the set of positive integers that are multiples of, how many integers are in the intersection ofand?

　　Answer Choices

　　(A) None

　　(B) One

　　(C) Seven

　　(D) Thirteen

　　(E) More than thirteen

　　The correct answer is E

　　Explanation

　　The intersection of sets and is the set of integers that are in and also in . Set consists of all positive integers that are multiples of , and set consists of all positive integers that are multiples of , so the intersection of and is the set of positive integers that are multiples of both and . This is the set of all positive integers that are multiples of . There are an infinite number of positive integers that are multiples of , so there are more than thirteen integers in the intersection of and .

　　以上就是关于2012年12月14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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