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2012年10月27日SAT官方每日一题---数学选择

  下面是2012年10月27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.

  Ifs = 1 + (1 over 2) + (1 over 4) + (1 over 8) + (1 over 16) + (1 over 32)andt =1 + (1 over 2) times s, thentexceedssby

  (A)1 over 4 

  (B)1 over 8 

  (C)1 over 16 

  (D)1 over 32 

  (E)1 over 64 

  The correct answer is

  Explanation“texceedss” is interpreted mathematically as the value oft minus sand is evaluated as follows: 

Long Equation

  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:

  If x over 3 = x^2, the value of xcan be which of the following?

 roman numeral 1. negative 1 over 3  roman numeral 2. 0  roman numeral 3. 1 over 3 

  Answer Choices

  (A) roman numeral 1only 

  (B) roman numeral 2only 

  (C) roman numeral 3only 

  (D) roman numeral 2and roman numeral 3only 

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

  The correct answer is D

  Explanation

  Roman Numeral Answer Format

  Roman Numeral roman numeral 1: Can the value of xbe negative 1 over 3

  You could test this answer by substituting negative 1 over 3for xin the equation and seeing whether the result is true. But you can also reason this question out without substituting numbers: 

  If x = negative 1 over 3, then (negative (1 over 3))^2is a positive number, because any nonzero number squared is positive. 

  If x = negative 1 over 3, then x over 3is negative. 

  So x over 3is negative and x^2is positive. 

  Therefore, xcannot be negative 1 over 3

  Mark Roman numeral roman numeral 1with an “F” for false. 

  Roman Numeral roman numeral 2: Can the value of xbe 0

  This is a very easy substitution to make:x over 3 = x^2  0 over 3 = 0^2 = 0

  Roman numeral roman numeral 2is true, so mark it with a “T” for true. 

  Roman Numeral roman numeral 3: Can the value of xbe 1 over 3

  Substitute 1 over 3for x

  If x = 1 over 3, then x over 3 = 1 over 9.Also, x^2 = (1 over 3)^2 = 1 over 9

  Roman numeral roman numeral 3is true, so mark it with a “T” for true. 

  Check the Answers:

  You now know whether each of the Roman numeral statements is true or false:roman numeral 1is false.roman numeral 2is true.roman numeral 3is true. 

  Find the choice that says only roman numeral 2and roman numeral 3are true

  以上就是关于2012年10月27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。