Question

b) Tìm x, biết: 6,9 – 5x = 3,2 – 1,2 . 3

Answer 1

\(6,9-5x=3,2-1,2\cdot3\)
\(6,9-5x=3,2-3,6\)
\(6,9-5x=-0,4\)
\(5x=6,9-\left(-0,4\right)\)
\(5x=7,3\)
\(x=7,3:5\)
\(x=1,46\)

Answer 2

`6,9 - 5x = 3,2 - 1,2 . 3`

`=> 6,9 - 5x = 3,2 - 3,6`

`=> 6,9 - 5x = -0,4`

`=>  5x =6,9 +0,4`

`=> 5x=7,3`

`=> x= 7,3 : 5`

`=>x=1,46`

Answer 3

\(6,9-5x=3,2-1,2.3\)

\(6,9-5x=-0,4\)

\(5x=6,9-\left(-0,4\right)=6,9+-0,4\)

\(5x=7,3\)

\(x=\dfrac{7,3}{5}=1,46\)