Question

\(\left(x+0,7\right)^3=-27\)

Answer 1

`(x+0,7)^3=(-27)`

`(x+0,7)^3=(-3)^3`

`x+0,7=-3`

`x=-3-0,7=-3,7`

Answer 2

\(\left(x+0,7\right)^3=-27=\left(-3\right)^3\\ =>x+0,7=-3\\ =>x=-3-0,7=-3,7\)

Answer 3

\(\left(x+0,7\right)^3=-27\)

\(\left(x+0,7\right)^3=\left(-3\right)^3\)

\(\Rightarrow x+0,7=-3\)

\(x=-3-0,7\)

\(x=-3,7\)

Vậy \(x=-3,7\)