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    Work: Find the solution of equation （100-X）20(70-X) = 720 .
    Question type: Equation
    Solution:Original question:

(

100

−

X

)

×

20

(

70

−

X

)

=

720

    Remove the bracket on the left of the equation:

Left side of the equation =

100

×

20

(

70

−

X

)

−

X

×

20

(

70

−

X

)

=

2000

(

70

−

X

)

−

X

×

20

(

70

−

X

)

=

2000

×

70

−

2000

X

−

X

×

20

(

70

−

X

)

=

140000

−

2000

X

−

X

×

20

(

70

−

X

)

=

140000

−

2000

X

−

X

×

20

×

70

+

X

×

20

X

=

140000

−

2000

X

−

X

×

1400

+

X

×

20

X

=

140000

−

3400

X

+

X

×

20

X

    The equation is transformed into :

140000

−

3400

X

+

X

×

20

X

=

720

    The solution of the equation:
        X₁≈68.844506 , keep 6 decimal places
        X₂≈101.155494 , keep 6 decimal places    
    There are 2 solution(s).

解程的详细方法请参阅：《方程的解法》

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