Overview: 3 questions will be solved this time.Among them
           ☆3 equations

[ 1/3 Equation]
    Work: Find the solution of equation x1－x2＋2x3 = 2 .
    Question type: Equation
    Solution:Original question:

x

×

1

−

x

×

2

+

2

x

×

3

=

2

Left side of the equation =

x

×

1

−

x

×

2

+

6

x

=

5

x

    The equation is transformed into :

5

x

=

2

    The coefficient of the unknown number is reduced to 1 :

x

=

2

÷

5

=

2

×

1 5

    We obtained :

x

=

2 5

    This is the solution of the equation.

    Convert the result to decimal form :

x

=

0.4

[ 2/3 Equation]
    Work: Find the solution of equation －x1＋2x2－3x3 = 3 .
    Question type: Equation
    Solution:Original question:

-

x

×

1

+

2

x

×

2

−

3

x

×

3

=

3

Left side of the equation =

-

x

×

1

+

4

x

−

9

x

=

-

6

x

    The equation is transformed into :

-

6

x

=

3

    By shifting the terms and changing the symbols on toth sides of the equation, we obtain :

-

3

=

6

x

    If the left side of the equation is equal to the right side, then the right side must also be equal to the left side, that is :

6

x

=

-

3

    The coefficient of the unknown number is reduced to 1 :

x

=

-

3

÷

6

=

-

3

×

1 6

=

-

1

×

1 2

    We obtained :

x

=

-

1 2

    This is the solution of the equation.

    Convert the result to decimal form :

x

=

- 0.5

[ 3/3 Equation]
    Work: Find the solution of equation 2x1－3x2＋5x3 = －1 .
    Question type: Equation
    Solution:Original question:

2

x

×

1

−

3

x

×

2

+

5

x

×

3

=

-

1

Left side of the equation =

2

x

−

6

x

+

15

x

=

11

x

    The equation is transformed into :

11

x

=

-

1

    The coefficient of the unknown number is reduced to 1 :

x

=

-

1

÷

11

=

-

1

×

1 11

    We obtained :

x

=

-

1 11

    This is the solution of the equation.

    Convert the result to decimal form :

x

=

- 0.090909

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