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    Work: Find the solution of equation （40-x/10）（20十X） = 1200 .
    Question type: Equation
    Solution:Original question:

(

40

−

x

÷

10

)

(

20

+

x

)

=

1200

    Remove the bracket on the left of the equation:

Left side of the equation =

40

(

20

+

x

)

−

x

÷

10

×

(

20

+

x

)

=

40

×

20

+

40

x

−

x

×

1 10

(

20

+

x

)

=

800

+

40

x

−

x

×

1 10

(

20

+

x

)

=

800

+

40

x

−

x

×

1 10

×

20

−

x

×

1 10

x

=

800

+

40

x

−

x

×

2

−

x

×

1 10

x

=

800

+

38

x

−

x

×

1 10

x

    The equation is transformed into :

800

+

38

x

−

x

×

1 10

x

=

1200

    
        x≈10.835271 , keep 6 decimal places    
    There are 1 solution(s).

解一元一次方程的详细方法请参阅：《一元一次方程的解法》

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