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2013年2月3日SAT官方每日一题---数学选择

  下面是2013年2月3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:

  Mathematics > Standard Multiple Choice

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

13-MEM_QG_7_1.png

   The functiony = function f of x, defined fornegative 1.5 is less than or equal to x is less than or equal to 1.5, is graphed above. For how many different values ofxisfunction f of x = 0.2?

  (A) None

  (B) One

  (C) Two

  (D) Three

  (E) Four

  The correct answer is E

  Explanation

  function f of x = 0.2when the point(x comma 0.2)is on the graph off. Drawing the liney = 0.2, as in the graph below, shows that they valueis equal to0.2for four values ofxbetweennegative 1.5and1.5.

math graphic

  下面是一道和SAT官方每日一题相似的题目,供大家练习:  

  If the function function fis defined by function f of x = (x minus a) times (x minus b) over (x minus c), where 0 less than a less than b less than c, for which of the following values of xis function fundefined? 

  roman numeral 1a  roman numeral 2b  roman numeral 3c 

  Answer Choices

  (A) None

  (B) roman numeral 1only 

  (C) roman numeral 3only 

  (D) roman numeral 1and roman numeral 2only 

  (E) roman numeral 1, roman numeral 2, and roman numeral 3 

  The correct answer is C

  Explanation

  If x = a, then (x minus a) times (x minus b) over (x minus c) = (a minus a) times (a minus b) over (a minus c) = 0 over (a minus c) = 0. If x = b, then (x minus a) times (x minus b) over (x minus c) = (b minus a) times (b minus b) over (b minus c) = 0 over (b minus c) = 0. If x = c, then (x minus a) times (x minus b) over (x minus c) = (c minus a) times (c minus b) over (c minus c) = (c minus a) times (c minus b) over 0, which is not defined because division by 0is undefined. Therefore, of the three values, a, b, and c, the only one for which function fis undefined is c. Thus the correct response is roman numeral 3

only. 

  以上就是关于2013年2月3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。