Question

Cho em hỏi cái này ạ!!!!!!!!

7^x÷7³=49

Answer 1

\(7^x:7^3=49\)

\(\Leftrightarrow7^x:7^3=7^2\)

\(\Leftrightarrow7^x=7^5\)

Vậy x=5

Answer 2

\(7^x:7^3=49\)

\(\Leftrightarrow7^{x-3}=7^2\)

\(\Leftrightarrow x-3=2\)

\(\Leftrightarrow x=3+2\)

\(\Leftrightarrow x=5\)

Vậy \(x=5\)