2017年11月11日SAT官方每日一题---数学选择.

　　下面是2012年11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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　　Mathematics > Standard Multiple Choice

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

　　In the figure above, which quadrants contain pairsthat satisfy the condition?

　　(A)only

　　(B)andonly

　　(C)andonly

　　(D)andonly

　　(E),,, and

　　The correct answer is C

　　Explanation

　　In order forto satisfy, it must be true thatandare equal to each other and not equal to zero. An example of such a pair is, which is in quadrant.

　　In quadrant, all thevalues are negative and all thevalues are positive, so inquadrant,andcannot be equal. For example, the pairdoes not satisfy the condition, since, not.

　　In quadrant, thevalues and thevalues are both negative, so it is possible forandto be equal. For example, the pairis in quadrantand.

　　In quadrant,andcannot be equal because thevalues are positive and thevalues are negative. For example, the pairdoes not satisfy the condition, since.

　　The quadrants that contain pairsthat satisfy the given condition are quadrantsandonly.

　　下面为大家提供一些和这些SAT官方每日一题相似的题目，供大家练习

　　In an solution of water and alcohol, the ratio by mass of water to alcohol is to . If grams of a solution consisting of grams water for each gram of alcohol is added to the solution, what fraction by mass of the new solution is alcohol?

　　Answer Choices

　　(A)

　　(B)

　　(C)

　　(D)

　　(E)

　　The correct answer is B

　　Explanation

　　To find what fraction by mass of the new solution is alcohol, you can find how many grams of alcohol are in the final solution of grams. Since the solution is part alcohol to parts water, it is alcohol. So it contains grams of alcohol. Similarly, the solution is alcohol by mass, so it contains grams of alcohol. Thus, the final 20-gram solution contains grams of alcohol, so , or , of it is alcohol.

　　以上就是关于2012年11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。