a ) 2^x = 32 
=> 2⁵       
b ) 3^x = 243
=> 3⁵
c ) 2^x = 256
=> 2⁸ 

a,x=5

b,x=5

c,x=8

\(n=3\)

\(3^4.3^n=3^7\)

\(\Rightarrow4+n=7\)

\(\Rightarrow n=7-4=3\)

Vậy \(n=3\)

n=3

a ) 2ⁿ = 16 

2.2.2.2 = 16 nên n = 4

Vậy : 2⁴ = 16

b ) 4ⁿ = 64

4.4.4 = 64 nên n = 3

Vậy : 4³ = 64

c ) 15ⁿ = 225

15.15 = 225 nên n = 2

Vậy : 15² = 225

a) \(2^n=16\)

\(vi 16=2.2.2.2=2^4\)nen \(n=4\)

b) \(4^n=64\)

\(vi\)\(64=4.4.4=4^3\)nen \(n=3\)

c) \(15^n=225\)

\(vi\)\(225=15.15=15^2\)nen \(n=2\)

các cậu giúp tớ bài x mũ 50 nữa nha 

a) \(11^n=1331\)

\(\Rightarrow11^n=11^3\)

\(\Rightarrow n=3\)

b) \(n^3=125\)

\(\Rightarrow n^3=5^3\)

\(\Rightarrow n=5\)

c) \(5^4=n\)

\(\Rightarrow625=n\)

\(\Rightarrow n=625\)

d) \(\left(n+1^2\right)=9\)

\(\Rightarrow n+1=9\)

\(\Rightarrow n=9-1\)

\(\Rightarrow n=8\)

a) 11^n = 1331

⇒ 11^n = 11^3

⇔ n = 3

b) n^ 3 = 125

⇒ n^3 = 5^3

⇔ n = 5

c) 5^4 = n 

⇒ n = 625

d) ( n + 1^2 ) = 9

⇒ ( n + 1 ) = 9

⇒ n = 8 

\(2^n=8=2^3\Rightarrow n=3\\ 7^n=49=7^2\Rightarrow n=2\\ 4^n=64=4^3\Rightarrow n=3\\ 5^n=625=5^4\Rightarrow n=4\)

\(2^n=8\Rightarrow2^n=2^3\Rightarrow n=3\)

\(7^n=49\Rightarrow7^n=7^2\Rightarrow n=2\)

\(4^n=64\Rightarrow4^n=4^3\Rightarrow n=3\)

\(5^n=625\Rightarrow5^n=5^4\Rightarrow n=4\)

\(2^n=8=2^3\)

=>n=3

\(7^n=49=7^2\)

=>n=2

\(4^n=64=4^3\)

=>n=3

\(5^n=625=5^4\)

=>n=4

\(8^n:2^n=4\)

\(\Leftrightarrow\left(2^3\right)^n:2^n=2^2\)

\(\Leftrightarrow2^{3n}:2^n=2^2\)

\(\Leftrightarrow3n-n=2\)

\(\Leftrightarrow2n=2\)

\(\Leftrightarrow n=1\)