\(\eqalign{& a)\,\root 3 \of x = - 1,5 \Leftrightarrow x = {\left( { - 1,5} \right)^3} \cr
& \Leftrightarrow x = - 3,375 \cr} \)
Vậy \(x=-3,375.\)
\(\eqalign{& b)\,\root 3 \of {x - 5} = 0,9 \Leftrightarrow x - 5 = {\left( {0,9} \right)^3} \cr
& \Leftrightarrow x - 5 = 0,729 \Leftrightarrow x = 5,729 \cr} \)
Vậy \(x=5,729.\)
