Question

[3×(x+2)÷7]×4=120

Tìm x

Answer 1

[ 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

Answer 2

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

\(3.\left(x+2\right):7=480\)
\(3.\left(x+2\right)=480.7\)
\(3.\left(x+2\right)=3360\)
\(x+2=3360:3\)
\(x+2=1120\)
\(x=1120-2\)
\(x=1118\)

Answer 3

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

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

[ 3 x ( 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

68 ban nha

Answer 5

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

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

[ 3 x ( 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 6

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

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

[ 3 x ( 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