k hộ mik nha alan walker ngầu lol
Ta có :\(\frac{x-5}{4}=\frac{-9}{5-x}\)
\(\Rightarrow\frac{x-5}{4}=\frac{\left(-9\right).\left(-1\right)}{\left(5-x\right).\left(-1\right)}\)
\(\Rightarrow\frac{x-5}{4}=\frac{9}{x-5}\)
=>(x-5).(x-5)=9.4
\(\Rightarrow\left(x-5\right)^2=36\)
\(\Rightarrow\orbr{\begin{cases}x-5=6\\x-5=-6\end{cases}}\) \(\Rightarrow\orbr{\begin{cases}x=11\\x=-1\end{cases}}\)
Vậy \(x=\left(11;-1\right)\)
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