a: =>(1/3)^m=(1/3)^4=>m=4b: \(\Leftrightarrow3^{3n-2}=3^n\)=>3n-2=n=>2n=2=>n=1c: =>2^n=4=>n=2d: =>\(2^{5n}\cdot2^{-4n}=2^{10}\)=>5n-4n=10=>n=10e: \(\Leftrightarrow3^n\left(\dfrac{1}{3}+\dfrac{5}{3}\right)=162\)=>3^n=81=>n=4Câu trả lời: a: =>(1/3)^m=(1/3)^4=>m=4b: \(\Leftrightarrow3^{3n-2}=3^n\)=>3n-2=n=>2n=2=>n=1c: =>2^n=4=>n=2d: =>\(2^{5n}\cdot2^{-4n}=2^{10}\)=>5n-4n=10=>n=10e: \(\Leftrightarrow3^n\left(\dfrac{1}{3}+\dfrac{5}{3}\right)=162\)=>3^n=81=>n=4