`[289.1+x.89:2]=-1`
`=>289+(89x)/2=-1`
`=>(89x)/2=-1-289=-290`
`=>89x=-580`
`=>x=-580/89`
Vậy `x=-580/89`
\(\left(289.1+x.89:2\right)=-1\)
\(289+x.\dfrac{89}{2}=-1\)
\(x.\dfrac{89}{2}=-1-289\)
\(x.\dfrac{89}{2}=-290\)
\(x=-290:\dfrac{89}{2}\)
\(x=\dfrac{-580}{89}\)