Overview: 1 questions will be solved this time.Among them
           ☆1 equations

[ 1/1 Equation]
    Work: Find the solution of equation （X－20）（－20＋80） = 150 .
    Question type: Equation
    Solution:Original question:

(

X

−

20

)

(

-

20

+

80

)

=

150

    Remove the bracket on the left of the equation:

Left side of the equation =

X

(

-

20

+

80

)

−

20

(

-

20

+

80

)

=

-

X

×

20

+

X

×

80

−

20

(

-

20

+

80

)

=

60

X

−

20

(

-

20

+

80

)

=

60

X

+

20

×

20

−

20

×

80

=

60

X

+

400

−

1600

=

60

X

−

1200

    The equation is transformed into :

60

X

−

1200

=

150

    Transposition :

60

X

=

150

+

1200

    Combine the items on the right of the equation:

60

X

=

1350

    The coefficient of the unknown number is reduced to 1 :

X

=

1350

÷

60

=

1350

×

1 60

=

45

×

1 2

    We obtained :

X

=

45 2

    This is the solution of the equation.

    Convert the result to decimal form :

X

=

22.5

Your problem has not been solved here? Please take a look at the  hot problems ！