# 表达式变换

 下载 嵌入代码 关闭 嵌入模拟程序控制 你可以通过改变嵌入的代码改变程序的宽度和高度 插入一张图片，当点击这个图片时启动仿真程序。

### 主题

• Equivalent Expressions
• Evaluating Expressions
• Simplifying Expressions

### 示范 学习目标

• Simplify expressions by combining like-terms
• Contextualize coefficients and like/unlike-terms
• Interpret an expression in both abstract and concrete representations
• Build an expression that is equivalent to a target

### 标准对齐

#### Common Core - Math

3.OA.A.1
Interpret products of whole numbers, e.g., interpret 5 × 7 as the total number of objects in 5 groups of 7 objects each. For example, describe a context in which a total number of objects can be expressed as 5 × 7.
5.OA.A.1
Use parentheses, brackets, or braces in numerical expressions, and evaluate expressions with these symbols.
6.EE.A.2
Write, read, and evaluate expressions in which letters stand for numbers.
6.EE.A.2b
Identify parts of an expression using mathematical terms (sum, term, product, factor, quotient, coefficient); view one or more parts of an expression as a single entity. For example, describe the expression 2 (8 + 7) as a product of two factors; view (8 + 7) as both a single entity and a sum of two terms.
6.EE.A.3
Apply the properties of operations to generate equivalent expressions. For example, apply the distributive property to the expression 3 (2 + x) to produce the equivalent expression 6 + 3x; apply the distributive property to the expression 24x + 18y to produce the equivalent expression 6 (4x + 3y); apply properties of operations to y + y + y to produce the equivalent expression 3y.
6.EE.A.4
Identify when two expressions are equivalent (i.e., when the two expressions name the same number regardless of which value is substituted into them). For example, the expressions y + y + y and 3y are equivalent because they name the same number regardless of which number y stands for..

### 教师指南

 仿真程序控制概述,简化模型,学生视角的思考 ( PDF ).

### 教师提交的活动

Comparando expresiones equivalentes Pam Branner, traducción de Diana López 高中

Games Remote Lesson ideas Trish Loeblein 初中

K-5

Remote

Adding and Subtracting Expressions Amanda McGarry 初中 指导 数学
Algebraic Expressions Amanda McGarry 初中 指导 数学
Generating Equivalent Expressions Amanda McGarry 初中 指导 数学
Equivalent Expression Exploration Kimberly Struck 初中 指导 数学
Like Terms and How to Combine Them Julie Carres 初中 指导 数学
Comparing Equivalent Expressions Pam Brenner 初中

SECUNDARIA: Alineación PhET con programas de la SEP México (2011 y 2017) Diana López 高中

PREPARATORIA: Alineación de PhET con programas de la DGB México (2017) Diana López 高中

Middle School Math Sim Alignment Amanda McGarry 初中 其它 数学
Adierazpen baliokideak alderatzea José Manuel López Irastorza 高中 指导 数学
Modelo de Áreas, Cambio de Expresiones Andrés Gualberto Palomo Cuevas 高中 家庭作业
Remote

Continuación de Cambio de Expresiones Andrés Gualberto Palomo Cuevas 高中 家庭作业

Cambio de Expresiones Andrés Gualberto Palomo Cuevas 高中 家庭作业
Remote

Variables and Coefficients Lisa Nitzsche K-5

Adding Negations Julie Carres 初中 指导 数学

### HTML5 程序：

iOS 8+ Safari

Android:

Chromebook:

Windows 系统:

Macintosh 系统:
OS 10.9.5 或之后的系统版本，Safari 9+版本，或者火狐浏览器，谷歌浏览器的最新版本均支持我们的程序。

Linux 系统:

### Java and Flash 程序：

Java 与 Flash程序可以在PC端，mac端，及linux系统上运行。具体的系统配置要求如下：

Windows 系统:
Windows 10, 8.1, 7

Macintosh 系统:
Mac OS X 10.9.5+

64位浏览器（例如Safari，火狐，谷歌等）

Linux 系统:
Oracle Linux 5.5+1
Oracle Linux 6.x (32位), 6.x (64位)2
Oracle Linux 7.x (64位)2
Red Hat Enterprise Linux 5.5+1, 6.x (32位), 6.x (64位)2
Ubuntu Linux 12.04 LTS, 13.x
Suse Linux Enterprise Server 10 SP2+, 11.x

• John Blanco (developer)
• David Webb
• Kathy Perkins
• Ariel Paul
• almond-0.2.9.js
• base64-js-1.2.0.js
• easing-equations-r12
• FileSaver-b8054a2.js
• font-awesome-4.5.0
• game-up-camera-1.0.0.js
• himalaya-0.2.7.js
• jama-1.0.2
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• lodash-4.17.4.js
• pegjs-0.7.0.js
• seedrandom-2.4.2.js
• text-2.0.12.js
• TextEncoderLite-3c9f6f0.js
• Tween-r12.js