Question

giúp mình với

3ⁿ : 3⁴ = 243

Answer 1

Ta có :

\(3^n:3^4=243\)

\(\Rightarrow3^{n-3}=3^5\)

\(\Rightarrow n-3=5\)

\(\Rightarrow n=3+5=8\)

Answer 2

\(3^n:3^4=243\)

\(3^n=243.3^4\)

\(3^n=243:81\)

\(3^n=3\)

\(\Rightarrow n=1\)

vay \(n=1\)

Answer 3

3ⁿ:3⁴=243

=> 3^n-4=3⁵

=> n-4=5

=> n=5+4

=>n=9

Answer 4

3ⁿ:3⁴=243

3ⁿ=243:81

N=3:3

N=1

Vay n=1

Answer 5

\(3^n:3^4=243\)

\(3^n=243.3^4\)

\(3^n=3^5.3^4\)

\(3^n=3^{5+4}\)

\(3^n=3^9\)

\(\Rightarrow n=9\)

vay \(n=9\)

Answer 6

\(3^n:3^4=243\)

\(\Rightarrow3^{n-4}=243\)

\(\Rightarrow3^{n-4}=3^{5^{ }}\)

\(\Rightarrow n-4=5\)

\(\Rightarrow n=5+4\)

\(\Rightarrow n=9\)