Question

Tìm x biết:

5^x . (5³)² = 625

Answer 1

5^x . ( 5³ )² = 625

<=> 5^x . 5⁶ = 625

<=> 5^x+6 = 625

<=> 5^x+6 = 5⁴

<=> x + 6 = 4

<=> x = -2

Answer 2

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

\(\Leftrightarrow5^x.5^6=625\)

\(\Leftrightarrow5^x=\frac{1}{5^2}\)

\(\Leftrightarrow x=-2\)

Answer 3

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

\(\Rightarrow5^x\times5^6=625\)

      \(5^{x+6}=5^4\)

 \(\Rightarrow x+6=4\)

      \(x=-2\)

    Vậy x = -2

Answer 4

                      Bài làm :

Ta có :

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

\(\Leftrightarrow5^x.5^6=5^4\)

\(\Leftrightarrow5^{x+6}=5^4\)

\(\Leftrightarrow x+6=4\)

\(\Leftrightarrow x=-2\)

Vậy x= - 2

Chúc bạn học tốt !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Answer 5

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

\(5^x.5^6=625\)

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

\(x+6=4\)

\(x=4-6 \)

\(x=-2\)

vậy \(x=-2\)