When Xiao Li solves equation 5A X 13, he mistakenly thinks X as X, and the solution of the equation

His square talk is 5a+x=13

The solution contains envy for x=-2

5a-2=13

5a=15, so the equation is 15-x=13

x=15-13x=2

Regarding the square code change of x, the solution of 5a+x=13 is x=-2, so 5a-2=13, 5a=15, and the equation judged by Chi You is 15-x=13

5a+x=13 put x=2 into the equation.

5a+2=13

The solution is a = 11 5

Original equation: 5 11 5 + x = 13

11+x=13

x=2 The original equation is solved as 2 to help you write the process.

5a+x=13

x=13-5a=2

13-5a=2

5a=-11

a=11/5

The original equation is 11-x=13

x=13-11

The solution of the original equation x=-2 is x=-2

The key to solving the problem is to solve the value of a, and if -x is regarded as +x, then the equation is 5a+x=13 x=13-5a, and if x= -2 is wrong, then 13-5a = -2 a=3 brings in the correct equation 5a-x=13 15-x=13 x=2

The solution process can be written as: 5a+x=13

Because: x=-2

So 5a-2=13

a=3 is brought into equation 5a-x=13 to get:

15-x=13x=2

Mistaking "-x" for "+x" leads to the solution of the equation being x=-2, indicating that a is 3

Then the solution of the original equation is 2

5a+x=13 put x=2 into the equation.

5a+2=13

The solution is a = 11 5

Original equation: 5 11 5 + x = 13

11+x=13

x=2 The original equation is solved as 2 to help you write the process.

The key to solving the problem is to solve the value of a, put.

x is seen as +x

Then the equation is 5a+x=13

x=13-5a

Misread the case x=

then 13-5a

a=3 brings in the correct equation 5a-x=13

15-x=13

x=2 The solution process can be written as: 5a+x=13

Because: x=-2

So 5a-2=13

a=3 brings in equation 5a-x=13

Get: 15-x=13x=2

Mistaking "-x" for "+x" leads to the solution of the equation being x=-2, indicating that a is 3

Then the solution of the original equation is 2

5a+x=13

Put x=2 into the equation.

5a+2=13

The solution is a = 11 5

Original equation: 5 11 5 + x = 13

11+x=13

x = 2 The original equation is solved as 2

Help you write out the process.

Answer C analysis: According to the question, the solution of equation 5a+x=13 is x=-2, you can get a=3 first, and then, substitute the original equation and solve it;

Answer: From the meaning of the question, 5a-2=13, solution, a=3, the original equation is 15-x=13, solution, x=2;

Therefore, choose C Comment: This question examines the solution of a one-dimensional equation, and substituting the solution of the equation into the value of a is first found and then solved, and it is the key to understand the meaning of the question

Answer, support me.

Substituting x=-2 into equation 5a+x=13 yields:

5a-2=13

Solution: a=3

Substituting a=3 into the original equation 5a-x=13 yields:

5*3-x=13

Solution: x=2

Middle School Students' Mathematics, Physics and Chemistry] team wdxf4444 will answer for you! Good luck with your learning.

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The first step is to make mistakes and make mistakes, in order to seek A

5a+x=13

Substituting x=-2 gives a=3

The second step is to change from wrong to right, substitute the already known a, and eliminate the unknown.

5a-x=13, substitute a=3.

Get true x=2

This is so much text written for the sake of explanation, and the actual steps do not need to be explained in words, only the part with the calculation formula can be taken.

This is a type of question, and if you know the above 2 steps, you will be able to do the other questions.

5a-x=13

Solution: Substituting x=-2 into equation 5a+x=13 yields:

5a+（-2）=13

5a=13+2

a=3 substituting a=3 into the original equation 5a+x=13 to get :

15-x=13

x=13-15x=2

x=3 is substituted into the equation a=3 5

The original equation is 3-3x=12

x=-3

From 5a+3x=12, x=3 is solved to obtain a=3 5, and the original equation is brought into x=-3

Solution: According to the problem, x = -2 is the solution of equation 5a + x = 13, then there is 5a - 2 = 13

5a = 15

a = 3So, the original equation is 15 - x = 13

Solution: x=2