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一道SAT数学题及其解法

       SAT数学考试的难度对中国的考生来说不是很大,但是如果不经过一段时间的练习,想要拿到很高的分数还是有困难的。下面就为大家搜集了一道SAT数学题及其解法,供大家参考,希望给大家带来帮助。

       Ifabsolute value ((4 times x) minus 7) = 5

       absolute value (3 minus (8 times x)) = 1

 

  What value of xsatisfies both of the equations above?

 

  The correct answer is 1/2 or .5

       Explanation

  Difficulty: Medium

  

GraphGraph

 

  Since absolute value ((4 times x) minus 7) = 5, the value of (4 times x) minus 7is either 5or negative 5.

       (4 times x) minus 7 = 5

       4 times x = 12

       x = 3

 

  OR

       (4 times x) minus 7 = negative 5

       4 times x = 2

       x = 1 over 2

 

  The two values of xthat satisfy the first equation are 3and 1 over 2.

 

  Since absolute value (3 minus (8 times x)) = 1, the value of 3 minus (8 times x)is either 1or negative 1.

 

       3 minus (8 times x) = 1

       8 times x = 2

       x = 1 over 4

 

  OR

       3 minus (8 times x) = negative 1

       8 times x = 4

       x = 1 over 2

  The two values of xthat satisfy the second equation are 1 over 4and 1 over 2.

 

  You are asked to find the value of xthat satisfies both equations. That value is 1 over 2. The answer can be entered in the grid as 1 slash 2or .5

       以上就是这道SAT数学题的解法,非常详细,来自SAT考试的官方网站。大家可以在备考SAT数学的时候,对SAT数学题的出题思路和解题方法进行适当的总结,这样就可以更加熟练的应对SAT数学考试了。

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