使用分配财产重写表达式

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In This L esson
::在本课程中

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You will be practicing rewriting expressions using the distributive property. The distributive property was  reviewed in the lesson, . For any three numbers,  $\begin{array}{r}a,\end{array}$   $\begin{array}{r}b,\end{array}$  and $\begin{array}{r}c,\end{array}$   $\begin{array}{r}a(b+c)=ab+ac\end{array}$ . Recall that  $\begin{array}{r}a\end{array}$  is being multiplied by what is inside the " data-term="Parentheses" role="term" tabindex="0"> parentheses . 
::您将使用分配属性练习重写表达式。 分配属性在课程中被审查 。 对于任意三个数字, a、 b、 c、 a (b+c) =ab+ac 。 请注意, a 乘以括号内的内容 。

 

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Distribute Me
::分配我

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Charley's math teacher told her to expand  the expression  $\begin{array}{r}\frac{1}{2}\left(4a-5\right)\end{array}$ , but she doesn't know where to start. Using the interactive, drag the  $\begin{array}{r}\frac{1}{2}\end{array}$  to the  $\begin{array}{r}4a\end{array}$   and the  $\begin{array}{r}-5\end{array}$  to see what happens. Then, repeat this process for the other two expressions .
::Charlie的数学老师告诉她扩展12(4a)-5表达式, 但她不知道该从何开始。 使用互动, 将 12 拖到 4a 和 5 来查看结果 。 然后, 请重复此进程, 给另外两个表达式 。

 

 

 

 

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In this next interactive, you will be reviewing factors.  Recall that a factor is a smaller number that goes into a larger number. 2 is a factor of 6, 5 is a factor of 15 $\begin{array}{r}y\end{array}$ , and -8  is a factor of -32,  and so on.
::在接下来的交互式互动中,您将审查各种因素。 回顾一个因素是一个较小的数字,会进入一个较大的数字。 2是6, 5是15y的系数, 和 -8是-32的系数,等等。

 

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Factor Burst 
::下押因数

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For this interactive, you are going to "pop" the composite numbers (numbers that have factors).  If a number is prime (only factors are itself and 1), do not click on it. If you click on a composite number and those factors have more factors, click on those. Continue to click on numbers until only prime numbers remain. 
::对于此交互式数字, 您将使用“ 流行” 复合数字( 有因数的数字 ) 。 如果一个数字是质数( 只有因数本身和1), 请不要单击它。 如果您点击一个复合数字, 并且那些因数有更多的因数, 请点击这些因数。 继续单击数字, 直到仅保留质数 。

 

 

 

 

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In the previous interactive, the concept of a Greatest Common Factor (GCF) was reviewed.  Remember, that when you are finding the GCF, you need to determine what is the largest number that goes into both numbers in the problem.
::在上一次互动中,审查了“最大共同因素”的概念。记住,当你找到“全球合作框架”时,你需要确定在问题的两个数字中最大的数字。

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Lastly, in this lesson, you will use the d istributive p roperty backward. Instead of distributing a number in front of a set of parentheses to what is inside, you will take a sum of two numbers (with a variable) and break it apart into two factors.  
::最后,在这个教训中,您会使用分配属性向后。您不会在一组括号前分配数字到里面的内容,而是拿两个数字(加上一个变量)的总和,将其分成两个因素。

 

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Factor Burst, Part 2
::第2部分因数

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Like the last interactive, you are going to "pop" numbers as they show up on the screen. However, in this version, now all the numbers are sums of two terms ; or an expression . You will need to determine if the sum of numbers has a GCF.  If they do, click on it to pull out the GCF and see what remains. If a number is prime (only factors are itself and 1), do not click on it. 
::和上次互动的一样, 您将会在屏幕上显示“ 流行” 数字。 但是, 在本版本中, 现在所有数字都是两个词的总和; 或者表达式 。 您需要确定数字的总和是否含有一个 GEF 。 如果是的话, 请点击它来拉出 GEF 并查看剩下的数字 。 如果数字是主要数字( 只有因素本身和1), 请不要点击它 。