Question

Bai 1tim x

A,123-5.(x+4)=38

B,10+2x=2.(3² -1)

 

Answer 1

a,123-5(x+4)=28

(=)5(x+4)=85

(=) x+4=17

(=) x=13

b,10+2x=2.\(\left(3^2-1\right)\)

(=) 10+2x=16

(=) 2x = 6 

(=)x=3

Answer 2

A, 123-5.(x+4)=38

            5.(x+4)=123-38

           5.(x+4) =85

               (x+4)=85:5

               (x+4)=17

                x      =17-4

                x      =13

B, 10+2x=2(\(3^2-1\))

     10+2x=2.8

     10+2x=16

           2x=16-10

           2x=6

             x=6:2

            x  =3

Answer 3

a, 123 - 5(x + 4) = 38

=>5(x + 4) = 85

=> x + 4 = 17

=> x = 13

vậy_

10 + 2x = 2(3² - 1)

=> 10 + 2x = 2.8

=> 10 + 2x = 16

=> 2x = 6

=> x = 3

vậy_

Answer 4

Bài 1 :Tìm x : 

A , 123 - 5 . ( x + 4 ) = 38 

<=> 5 . ( x + 4 ) = 123 - 38 

<=> 5 . ( x + 4 ) = 85 

<=> x + 4 = 85 : 5 

<=> x + 4 = 17 

<=> x = 17 - 4 

<=> x = 13 

Vậy x = 13

B, 10 +  2x = 2 . ( 3² - 1 ) 

<=> 10 + 2x = 2 . ( 9 - 1 ) 

<=> 10 + 2x = 2 . 8 

<=> 10 + 2x = 16 

<=> 2x = 16 - 10 

<=> 2x = 6

<=> x = 6 : 2

<=> x = 3

Vậy x = 3