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Bạn tham khảo bài.
`a,`
`(2x-1)^3=8`
`⇒ (2x-1)^3=2^3`
`⇒2x-1=2`
`⇒2x=2+1`
`⇒2x=3`
`⇒x=3/2`
Vậy `x=3/2`
`b,`
`(2x-3)^2=9`
`⇒` \(\left[ \begin{array}{l}(2x-3)^2=3^2\\(2x-3)^2=(-3)^2\end{array} \right.\) $\\$ `=>` \(\left[ \begin{array}{l}2x-3=3\\2x-3=-3\end{array} \right.\) $\\$ `=>` \(\left[ \begin{array}{l}2x=3+3\\2x=-3+3\end{array} \right.\) $\\$ `=>` \(\left[ \begin{array}{l}2x=6\\2x=0\end{array} \right.\) $\\$ `=>` \(\left[ \begin{array}{l}x=3\\x=0\end{array} \right.\)
Vậy `x=3,x=0`
