3.4 上下文中的等等同表达式-interactive

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• 选择节上下文中等等同表达式

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  上下文中等等同表达式

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  In This Lesson
  ::在本课程中

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  You will  start by learning different ways  to   express  mathematical operations using words. Then, you will practice writing expressions given a context and solving those expressions using methods used in .
  ::首先,您将学习用文字表达数学操作的不同方法。 然后, 您将练习写入表达式给定一个上下文, 并使用在 中使用的方法解析这些表达式 。

    

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  Interpreting Operators and Expressions 
  ::解释运算符和表达式

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  As you already know, words can be interpreted into mathematical sentences. Here, you will determine more words that represent mathematical operators. 
  ::正如您已经知道的, 单词可以被解读为数学句。 在这里, 您将决定更多代表数学运算符的单词 。

  

  INTERACTIVE

  Mathematical Operators

  

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  • Click the mathematical operators at the top and match them to their associated vocabulary words below.
    ::单击顶部的数学运算符,使其与下面相关的词汇单词匹配。
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  • Press "Check" when you think you're done.
    ::当你认为你做完了就按"检查"键

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  What's Your Number ?
  ::你的号码是多少?

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  Three consecutive whole numbers add up to be 4 times the smallest number, minus one.  Can you determine what the three numbers are?
  ::连续连续三个数字加起来是最小数字的4倍,减1。你能确定这三个数字是什么吗?

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  All the pieces to the mathematical puzzle are in the box below. Your job is to make two from the clues above. Set them equal to each other and you can determine what the three numbers are!
  ::数学谜题的所有部分都在下面的方框中。 您的任务就是从上面的线索中提取两个。 把它们等同起来, 您可以决定这三个数字是什么 !

  

  INTERACTIVE

  Creating Equations Part 1

  

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  "Three consecutive whole numbers add up to be 4 times the smallest number, minus one."
  ::"连续三个整数加起来是最小数的4倍,减1"

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  • Use the   information above to fill in the blanks below.
    ::使用上述信息填充下面的空白。
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  • Click the drop down menus to select your answers.
    ::单击下拉菜单来选择答案 。
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  • Click the "check" button to check your answers.
    ::单击“ check” 按钮来检查您的答案 。

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  1.

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  What does "consecutive" mean in this context?
  ::在这种情况下,“连带性”意味着什么?

  a 播放段落

  Logical
  ::逻辑逻辑

  b 播放段落

  Equal
  ::平等

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  The result
  ::结果结果

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  Following one another in order
  ::相继相继相继相继相继相续,

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  Discussion Question
  ::讨论问题

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  Three consecutive whole numbers add up to be 4 times the smallest number, minus one. How would you approach this problem? What strategies could you use? How can you tell if you are in the right track?
  ::连续三个数字加起来是最小数字的4倍,减1倍。 您如何解决这个问题? 您可以使用什么策略? 您如何判断您是否走对了方向 ?

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  Did you figure out what the three consecutive integers were? 
  ::你知道连续三个整数是什么吗?

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  The two expressions,  $\begin{array}{r}3x+3\end{array}$  and  $\begin{array}{r}4x-1\end{array}$ , are only equivalent for one value of $\begin{array}{r}x.\end{array}$  When the two expressions are set equal to each other, this value of $\begin{array}{r}x\end{array}$  is called the solution to the equation . The solution will make the equation a true statement. Since you do not know how to solve an equation just yet, start substituting in values for $\begin{array}{r}x\end{array}$  and see if the two sides are equal. When you find the value for $\begin{array}{r}x\end{array}$  that makes both sides the same value, then you have found the solution. Remember, the problem asked for the three consecutive numbers.  $\begin{array}{r}x\end{array}$  is the smallest of the three numbers, so you will need to add once to find the next number, and one again to find the last number.
  ::两个表达式, 3x+3 和 4x- 1, 仅相当于 x 的一个值。 当两个表达式被设置为对齐时, x 的这个值被称为方程式的解决方案。 解决方案将使方程式成为真实的语句。 由于您尚不知道如何解答一个方程式, 开始替换 x 的数值, 并查看两边是否相等。 当您发现 x 的值使两边的数值相同时, 您就找到了解决方案 。 记住, 问题是连续的三个数字。 x 是这三个数字中最小的, 因此您需要添加一次以找到下一个数字, 然后再添加一次以找到最后一个数字 。

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  Mystery Age
  ::神秘时代

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  Your math teacher, Miss Nomer, gives you an extra credit problem to figure out her age.  Half of her age three years ago is equal to one-third of her age nine years from now. How old is she currently? 
  ::你的数学老师诺莫小姐 给了你一个额外的信用问题 来了解她的年龄 三年前她的一半 等于她九岁之后的三分之一

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  All the pieces to figure out Miss Nomer's age are in the box below. Your job is to make two equivalent expressions from the clues above. Set them equal to each other so you can determine her age and get extra credit.
  ::了解诺莫小姐年龄的所有碎片都在下面的盒子里。 您的任务就是从上面的线索中 得出两个等同的表达方式。 设置它们等同于对方, 这样您就可以确定她的年龄, 并获得额外信用 。

  

  INTERACTIVE

  Creating Equations Part 2

  

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  Half of her age three years ago is equal to one-third of her age nine years from now.    How old is she currently?
  ::三年前她的一半年龄等于她九岁之后的三分之一,目前她几岁?

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  • Use the   information above to fill in the blanks below.
    ::使用上述信息填充下面的空白。
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  • Click the dropdown menus to select your answers.
    ::单击下拉菜单来选择答案 。
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  • Click the "Check" button to check your answers.
    ::单击“ 检查” 按钮来检查您的答案 。

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     Summary
  ::摘要

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  • The solution to an equation is a value that makes the two expressions  on either side of the equal sign equivalent.  Once simplified they will equal the same number. 
    ::等式的解决方案是一个使等同符号等同物两侧的两个表达式组成的值。 一旦简化, 它们将等于相同数字 。