Question

 

Tìm xen khi biết

5 mũ 2 : 5 mũ x = 125

Answer 1

\(5^2:5^x=125\)

\(=>5^{2-x}=5^3\)

\(=>2-x=3=>x=-1\)

Vậy x=-1

Answer 2

5^2:5^x=125

5^x=25:125=1/5

=>x=-1

Answer 3

\(5^2:5^x=125\\ \Rightarrow25:5^x=125\\ \rightarrow5^x=25:125=\frac{1}{5}\\ \rightarrow5^x=\frac{1}{5^{-x}}\Rightarrow-x=1\\ \Rightarrow x=-1\)bạn nhé! Học tốt

Answer 4

         \(5^2:5^x=125\)

         \(5^{2-x}=5^3\)

 =>  \(2-x=3\)

 =>           \(x=2-3\)

 =>           \(x=-1\)

Answer 5

\(5^2:5^x=125\)

\(\Leftrightarrow5^{2-x}=125\)

\(\Leftrightarrow5^{2-x}=5^3\)

\(\Rightarrow2-x=3\Rightarrow x=-1\)

_Y nguyệt_

Answer 6

5²/5^x=5^2-x=125=5³

=>2-x=3

x=2-3

Vậy x=-1