下面是2012年10月18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 manager estimates that if the company chargesdollars for their new product, where, then the revenue from the product will bedollars each week. According to this model, for which of the following values ofwould the company’s weekly revenue for the product be the greatest?

　　(A)

　　(B)

　　(C)

　　(D)

　　(E)

　　The correct answer is D

　　Explanation

　　The graph ofis a downward-facing parabola that intersects the-axis atand at. Parabolas are symmetric, so the maximum value ofoccurs at, which is halfway betweenand. (When, the value ofis.)

　　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：

　　The length of rectangle is percent longer than the length of rectangle , and the width of rectangle is percent shorter than the width of rectangle . The area of rectangle is

　　Answer Choices

　　(A) greater than the area of rectangle

　　(B) greater than the area of rectangle

　　(C) equal to the area of rectangle

　　(D) less than the area of rectangle

　　(E) less than the area of rectangle

　　The correct answer is D

　　Explanation

　　Represent the length and width of rectangle as and . Then the area of is . The length of rectangle is longer than , which is , or . Similarly, the width of is , or . The area of

is, which simplifies to . From this it follows that the area of rectangle is less than the area of rectangle .

　　以上就是关于2012年10月18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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