2017年7月23日SAT官方每日一题---数学选择.

　　下面是是2012年7月23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。更多SAT备考资料请点击

　　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.

　　If, which of the following statements must also be true?

　　.

　　.

　　.　　

　　(A) None

　　(B)only

　　(C)only

　　(D)only

　　(E)and

　　The correct answer is E

　　Explanation

　　The quantitycan be expressed as. If, thenand. Since, eitheroror both. Therore, statementmust be true, but statement,, is not always true. For statement, you can write, and since, it follows that. Therore, both statementsandmust be true.

　　下面是一道和SAT官方每日一题相似的题目，供大家练习：

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

　　A 6-sided number cube, with faces numbered 1 through 6, is to be rolled twice. What is the probability that the number that comes up on the first roll will be less than the number that comes up on the second roll?

　　(A) 1 over 4

　　(B) 1 over 3

　　(C) 5 over 12

　　(D) 7 over 12

　　(E) 1 over 2　　

　　The correct answer is C

　　Explanation

　　The outcome space for this experiment is the set of all ordered pairs where represents the first number that comes up, and represents the second one. Since and can take all the values through , there will be a total of possible outcomes. The outcomes can be represented in a table as shown:　　

　　Among all the pairs , are pairs for which . So remaining pairs will have . Notice that the number of pairs for which is the same with the number of pairsfor which . Therore the number of pairsfor which , is (half of ). Then the probability that is equal to .

　　以上就是关于2012年7月23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。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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