a)
\(\dfrac{x-5}{3}=\dfrac{27}{x-5}\left(đk:x\ne5\right)\)
`=> (x-5)^2 =27xx3`
`=> (x-5)^2 = 81`
\(=>\left[{}\begin{matrix}x-5=9\\x-5=-9\end{matrix}\right.\\ =>\left[{}\begin{matrix}x=14\\x=-4\end{matrix}\right.\)
b)
\(\dfrac{-3}{5}x=\dfrac{2}{3}\\ =>x=\dfrac{2}{3}:\dfrac{-3}{5}\\ =>x=\dfrac{2}{3}\cdot\dfrac{5}{-3}\\ =>x=-\dfrac{10}{9}\)
a) Đề:
`=> (x-5)^2 = 27 xx 3`
`=> (x-5)^2 = 81`
`=> (x-5)^2 = 9^2`
`=> x - 5 = 9` hoặc `x - 5 = -9`
`=> x = 14` hoặc `x = -4`
Vậy `x = 14` hoặc `x = -4`
b) Đề:
`=> x = 2/3 : (-3)/5`
`=> x = 2/3 . (-5)/3 `
`=> x = -10/9`
Vậy `x = -10/9`