Question

[3×(x+2)÷7]×4=120

Answer 1

\(\left[3\cdot\left(x+2\right):7\right]\cdot4=120\)

\(\Rightarrow3\left(x+2\right):7=30\)

\(\Rightarrow3\left(x+2\right)=210\)

\(\Rightarrow x+2=70\)

\(\Rightarrow x=68\)

Vậy x=68

Answer 2

[ 3 .  ( x + 2 ) : 7 ] . 4 = 120

3 . ( x + 2 ) : 7 = 30 

3 . ( x + 2 ) = 210

x + 2 = 70 

x = 68

Nhớ li ke mk nha 

Answer 3

[3x(x+2):7] x 4 = 120

[3x(x+2):7]      = 120 : 4

[3x(x+2):7]      = 30

3 x (x+2)         = 30 x 7

3 x (x+2)         = 210

      x+2           = 210 : 3

      x+2           = 70

      x               = 70 - 2

      x               = 68

Answer 4

[3×(x+2)÷7]×4=120

3x(x +2) :7     =120 : 4=30

   (x +2) :7      = 30 :3  =10

    x +2          =10 x 7= 70

      x             = 70 - 2

      x             =68

nếu đúng k mình nha các bạn

Answer 5

[3(x + 2) : 7] . 4 = 120

=> 3(x + 2) : 7 = 120 : 4

=> 3(x + 2) : 7 = 30

=> 3(x + 2) = 30 . 7

=> 3(x + 2) = 210

=> x + 2 = 210 : 3

=> x + 2 = 70

=> x = 70 - 2

=> x = 68

Vậy x = 68