Question

Tim x :

5^x . (5³)² = 625

Answer 1

Mình k chép lại đề bài nữa nha!

5^x . 5⁶ =625

5^x+6= 5⁴

=>x+6=4

=> x=-2

vậy x=-2

Answer 2

\(5^x\cdot\left(5^3\right)^2=625\\ \Leftrightarrow5^x\cdot5^6=5^4\\ \Leftrightarrow5^x=\dfrac{5^4}{5^6}\\ \Leftrightarrow5^x=\dfrac{1}{5^2}\\ \Leftrightarrow5^x=5^{-2}\\ \Leftrightarrow x=-2\)

Vậy \(x=-2\)

Answer 3

\(5^x\cdot\left(5^3\right)^2=625\)

\(5^x\cdot5^6=5^4\)

\(5^x=5^4:5^6\)

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

\(x=-2\)

Vậy \(x=-2\).

Answer 4

5^x . (5³)² = 625

5^x . 5⁶ = 5⁴

5^x = 5⁴ :5⁶

5^x = 5^-2

\(\Rightarrow\) x = -2

Vậy x bằng -2