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2013年8月11日SAT官方每日一题---数学选择

  下面是2013年8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。大家和无忧小编一起来看一下这个SAT官方每日一题吧。

  SAT官方每日一题之数学---选择:

  Mathematics > Standard Multiple Choice

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

  If Kelly buystpens priced at2dollars each andupens priced at4dollars each, which of the following expresses, in terms oftandu, the average (arithmetic mean) price, in dollars, of these pens?

  (A)(3 times t) + (3 times u) over (t + u)

  (B)(3 times t) + (3 times u) over (t imes u)

  (C)(3 times t times u) over (t + u)

  (D)((2 times t) + (4 times u)) over (t + u)

  (E)((2 times t) + (4 times u)) over (t times u)

  The correct answer is D

  Explanation

  The average price of the pens is equal to the total price of all of the pens divided by the total number of pens. There aretpens priced at2dollars each, so the total price of these pens is2 times tdollars. There areupens priced at4dollars each, so the total price of these pens is4 times udollars. Thus the total price of all of the pens is(2 times t) + (4 times u)dollars, and the total number of pens ist + u, the average price, in dollars, of all of these pens is((2 times t) + (4 times u)) over (t + u).

  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 sum, product, and average (arithmetic mean) of three integers are equal. If two of the integers are0andnegative 5, the third integer is 

  (A)negative 5 

  (B)0 

  (C)2

   (D)5 

  (E)10 

  The correct answer is D

  Explanation

  You have three integers,0,negative 5, andx, whose sum, product, and average are equal. Since0is one of the numbers, the product is0. So the sum and average are also equal to0. Therefore,negative 5 + x + 0 = 0, andx = 5.

  以上就是关于2013年8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。