Đáp án:
Giải thích các bước giải:
`a) (3x-1)^3=1/{27}`
`(3x-1)^3=(1/3)^3`
`3x-1=1/3`
`3x=4/3`
`x=4/{12}`
`b) |2x+2/3|=5/6`
\(\left[ \begin{array}{l}2x+\frac{2}{3}=\frac{5}{6}\\2x+\frac{2}{3}=\frac{-5}{6}\end{array}
\right.\)
\(\left[ \begin{array}{l}2x=\frac{1}{6}\\2x=\frac{-3}{2}\end{array}
\right.\)
\(\left[ \begin{array}{l}x=\frac{1}{12}\\x=\frac{-3}{4}\end{array}
\right.\)