Western Normal University Edition First Grade Mathematics Volume 1
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Hebei Education Edition Third Grade Mathematics Volume 1
Hebei Education Edition Seventh Grade Mathematics Volume 2
Beijing Normal University Edition Seventh Grade Mathematics Volume 2
Qingdao Edition Seventh Grade Mathematics Volume 1
People's Education High School Mathematics Edition B Compulsory Course 2
Beijing Normal University Edition Eighth Grade Mathematics Volume 1
Qingdao Edition Seventh Grade Mathematics Volume 2
Jiangsu Education Edition Fourth Grade Mathematics Volume 1
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People's Education Press First Grade Mathematics Volume 2
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Category | Format | Size |
---|---|---|
Hebei Education Edition Seventh Grade Mathematics Volume 2 | pptx | 6 MB |
Description
"System of linear equations in two variables" PPT
Part One: Review and Objectives
review review
An equation that contains an unknown number, the degree of the unknown number is 1, and the coefficient is not equal to 0 is called a linear equation of one variable.
The value of the unknown that makes the left and right sides of the equation equal is called the solution of the equation.
learning target:
1. Understand the concepts of linear equations of two variables and systems of linear equations of two variables.
2. Understand the concepts of solutions to linear equations of two variables and solutions to systems of linear equations of two variables.
3. And will check whether the value of a set of unknown numbers is the solution of the equation or the solution of the system of equations
Study guide:
Read the contents of P2~3 of the textbook carefully and complete:
1. Understand the concepts of linear equations of two variables, systems of linear equations of two variables and their solutions.
2. Be able to transform practical problems into a system of linear equations of two variables by setting two unknowns. Can test solutions to equations or systems of equations
After 5 minutes, compare who can complete the test and practice correctly
System of linear equations of two variables PPT, the second part of the content: Discuss:
In the above equations X-Y=2 and X+1=2(Y-1), do X and Y have the same meaning?
The meanings of X and Y are the same respectively. Therefore, X and Y must satisfy the equations X-Y=2 and X+1=2(Y-1) at the same time. By combining them, we get:
X-Y=2
X+1=2(Y-1)
Like this, when two linear equations are put together, there are two unknowns, thus forming a system of linear equations in two variables.
Generally speaking, the common solution of two equations of a system of linear equations of two variables is called the solution of this system of linear equations of two variables.
A system of linear equations in two variables has one and only one solution.
Can you tell me how to check their solutions?
System of linear equations in two variables PPT, part 3: after-class exercises
1. Multiple choice questions
1. The linear equation of two variables 3x+2y=11 ( )
A. Any pair of rational numbers is its solution
B. There is only one solution
C. There are only two solutions
D. Infinitely many solutions
2. The following system of equations: (x, y are unknowns, a, b are constants)
x+y=3 2x+y=1 x=3 x=a
⑴ ⑵ ⑶ ⑷
2x-y=3 y+z=2 y=4 x-y=b
Among them, the number of systems of linear equations of two variables is ( )
A, 1 B, 2 C, 3 D, 4
System of linear equations in two variables PPT, part 4 content: Class summary:
1. The equation contains two unknowns (x and y), and the exponents of the unknowns are both 1. An equation like this is called a linear equation of two variables.
2. After combining the two linear equations, there are two unknowns, forming a system of linear equations in two variables.
3. The values of the two unknowns that make the values on both sides of a linear equation of two variables equal are called solutions to the linear equation of two variables.
4. Generally, the common solution of the two equations of a system of linear equations of two variables is called the solution of the system of linear equations of two variables.
5. A linear equation of two variables has infinite solutions; a system of linear equations of two variables has one and only one solution.
Keywords: Free download of Hebei Education Edition mathematics PPT courseware for seventh grade volume 2, PPT download of linear equations in two variables, .PPT format;
For more information about the "System of Linear Equations in Two Variables" PPT courseware, please click the "System of Linear Equations in Two Variables" ppt tag.
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"Solution of linear equations of two variables" PPT download:
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Update Time: 2024-09-04
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