`a)\root[3]{x}=-1,5`
`<=>x=-3,375`
Vậy `S={-3,375}`
______________________
`b)\root[3]{x-5}=0,9`
`<=>x-5=0,729`
`<=>x=5,729`
Vậy `S={5,729}`
`a.`\(\sqrt[3]{x}=-1,5\)
\(\Leftrightarrow\left(\sqrt[3]{x}\right)^3=\left(-1,5\right)^3\)
\(\Leftrightarrow x=-3,375\)
Vậy \(S=\left\{-3,375\right\}\)
`b.`\(\sqrt[3]{x-5}=0,9\)
\(\Leftrightarrow\left(\sqrt[3]{x-5}\right)^3=\left(0,9\right)^3\)
`<=>x-5=0,729`
`<=>x=5,729`
Vậy \(S=\left\{5,729\right\}\)
`a, x = -1,5^3 = -3,375`
`b,x - 5 = 0,9^3`
`x = 0,729 + 5`
`x = 5,729`
