ĐKXĐ:...
Đặt \(\frac{1}{x-3}=m\Rightarrow\frac{1}{m}=x-3\Leftrightarrow x+1=\frac{1}{m}+4\)
\(\frac{1}{y-4}=n\Rightarrow\frac{1}{n}=y-4\Leftrightarrow y-2=\frac{1}{n}+2\)
\(\Rightarrow\left\{{}\begin{matrix}m+n=1\\\left(\frac{1}{m}+4\right).m+\left(\frac{1}{n}+2\right).n=5\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}m+n=1\\4m+2n+2=5\end{matrix}\right.\)
Giải nốt nhé :)