Question

25 <5^n : 5 <625

 

Answer 1

n = 4 bn nhé

Answer 2

n = 4 bn nhé

Answer 3

\(25< 5^n:5< 625\)
\(\Rightarrow5^2< 5^{n-1}< 5^4\)
\(\Rightarrow2< n-1< 4\)
\(\Rightarrow n-1=3\)

\(\Rightarrow n=3+1\)

\(\Rightarrow n=4\)

Answer 4

n = 4 uk k nha nha

Answer 5

25 <5^n : 5 <625

=> 5^2<5^n-1<5^4

=>2<n-1<4

=> n-1​=3

n=4

Answer 6

\(25<\frac{5^n}{5}<625\Leftrightarrow5^2<\frac{5^n}{5}<5^3\Leftrightarrow5^3<5^n<5^4\Rightarrow\)

3<n<4 nếu nghiêm nguyên thì vô nghiệm