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一道SAT数学计算题

        SAT数学题分成了选择题和计算题,相对于SAT数学选择题,答案还有一些提示的作用,SAT数学计算题就需要大家自己进行解答了。下面为大家推荐的这道SAT数学计算题是非常典型的代数方程类的题目,大家一起来看看吧。

  absolute 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 is1/2 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数学计算题的全部内容,后面附有详细的答案解析。这道SAT数学题的难度并不是很大,一元一次方程,对于中国的考生来说应该还是很简单的,但是这道题目答案的书写方面比较特殊,需要大家注意。大家也可以参加北京SAT培训班来接触更多的SAT数学题,详细信息

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