a/ ĐK x>0
\(log_{2017}x+log_{2016}x=0\Leftrightarrow\dfrac{lnx}{ln2017}+\dfrac{lnx}{ln2016}=0\)
\(\Leftrightarrow lnx\left(\dfrac{1}{ln2017}+\dfrac{1}{ln2016}\right)=0\Leftrightarrow lnx=0\Rightarrow x=1\)
b/ ĐK \(\left\{{}\begin{matrix}x-1>0\\x-1\ne1\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}x>1\\x\ne2\end{matrix}\right.\)
\(x^3-5x^2+6x=0\Leftrightarrow x\left(x^2-5x+6\right)=0\Rightarrow\left[{}\begin{matrix}x=0\left(l\right)\\x=2\left(l\right)\\x=3\end{matrix}\right.\) \(\Rightarrow x=3\)