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

[ 1/3 Equation]
    Work: Find the solution of equation x1+0x2+3x3+0x4+0x5 = 4 .
    Question type: Equation
    Solution:Original question:

x

×

1

+

0

x

×

2

+

3

x

×

3

+

0

x

×

4

+

0

=

4

Left side of the equation =

x

×

1

+

0

x

+

9

x

+

0

x

+

0

x

=

10

x

    The equation is transformed into :

10

x

=

4

    The coefficient of the unknown number is reduced to 1 :

x

=

4

÷

10

=

4

×

1 10

=

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+x2+x3+x4+x5 = 12 .
    Question type: Equation
    Solution:Original question:

x

×

1

+

x

×

2

+

x

×

3

+

x

×

4

+

x

×

5

=

12

Left side of the equation =

15

x

    The equation is transformed into :

15

x

=

12

    The coefficient of the unknown number is reduced to 1 :

x

=

12

÷

15

=

12

×

1 15

=

4

×

1 5

    We obtained :

x

=

4 5

    This is the solution of the equation.

    Convert the result to decimal form :

x

=

0.8

[ 3/3 Equation]
    Work: Find the solution of equation x1+x2+x3+x4+x5 = 18 .
    Question type: Equation
    Solution:Original question:

x

×

1

+

x

×

2

+

x

×

3

+

x

×

4

+

x

×

5

=

18

Left side of the equation =

15

x

    The equation is transformed into :

15

x

=

18

    The coefficient of the unknown number is reduced to 1 :

x

=

18

÷

15

=

18

×

1 15

=

6

×

1 5

    We obtained :

x

=

6 5

    This is the solution of the equation.

    Convert the result to decimal form :

x

=

1.2

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