Đáp án:
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`e,`
`x ÷ (-1/3)^3 = (-1)/3`
`↔ x = (-1)/3 × (-1/3)^3`
`↔ x = (-1/3)^4`
`↔ x = 1/81`
Vậy `x = 1/81`
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`f,`
`(-3/5)^2 × x = (3/5)^2`
`↔ x = (3/5)^2 ÷ (-3/5)^2`
`↔ x = (3/5 ÷ (-3)/5)^2`
`↔ x = (-1)^2`
`↔ x= 1`
Vậy `x=1`
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`g,`
`(x×x)/27 = 81`
`↔ x^2 = 27 × 81`
`↔ x^2 = 2187`
`↔` \(\left[ \begin{array}{l}x^2=(3^{\dfrac{7}{2} })^2\\x^2=(-3^{\dfrac{7}{2} })^2\end{array} \right.\)
`↔` \(\left[ \begin{array}{l}x=3^{\dfrac{7}{2} }\\x=-3^{\dfrac{7}{2} }\end{array} \right.\)
Vậy $x = 3^{\dfrac{7}{2} }$ hoặc $x = -3^{\dfrac{7}{2} }$
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`h,`
`x^8/9 = 729`
`↔ x^8 = 9 × 729`
`↔ x^8 = 6561`
`↔` \(\left[ \begin{array}{l}x^8=3^8\\x^8=(-3)^8\end{array} \right.\)
`↔` \(\left[ \begin{array}{l}x=3\\x=-3\end{array} \right.\)
Vậy `x=3` hoặc `x=-3`
