Question

tìm x, biết:

a. (8x + 1) : 5 = 5

b. (5x - 6) + 12 = 46

 

Answer 1

a: =>8x+1=25

=>8x=24

hay x=3

b: =>5x-6=34

=>5x=40

hay x=8

Answer 2

\( (8x + 1) : 5 = 5\)

\( 8x + 1 = 5\)\(\times\)\(5\)

\(8x + 1=25\)

\(8x =25-1\)

\(8x =24\)

\(x=24:8\)

\(x=3\)

 

\((5x - 6) + 12 = 46\)

\(5x - 6 = 46- 12\)

\(5x - 6 =34\)

\(5x =34+6\)

\(5x =40\)

\(x=40:5\)

\(x=8\)

Answer 3

a. (8x + 1) : 5 = 5

<=> 8x + 1 = 25

<=> 8x = 24

<=> x = 3

--------------------------

b. (5x - 6) + 12 = 46

<=> 5x - 6 = 34

<=> 5x = 40

<=> x = 8