Question

3^-m:81=27

Answer 1

3^-m: 81= 27

=> 3^-m= 3³. 3⁴

=> 3^-m= 3⁷

=> -m= 7

=> m= -7

Vậy m= -7

Answer 2

\(3^{-m}.81=27\)

\(\Rightarrow3^{-m}.3^4=3^3\)

\(\Rightarrow3^{-m}=3\)

\(\Rightarrow-m=1\)

\(\Rightarrow m=-1\)

Answer 3

3^-m:81=27

=>3^-m:3^4=3^3

=>3^-m=3^3.3^4

=>3^-m=3^7

=>m=7