Question

Tìm X biết

Answer 1

\(5^x=625\)

nên x=4

\(2^x+2^{x+3}=288\)

\(\Leftrightarrow2^x\cdot9=288\)

\(\Leftrightarrow2^x=32\)

hay x=5

Answer 2

\(a,5^x=5^4\\ x=4\\b,12^x=12^2\\ x=2\\ c,2^x =128:16\\ 2^x=8\\ 2^x=2^3\\ x=3\\ d,3^x=27.9\\ 3^x=243\\ 3^x=3^5\\ x=5\)