\(\left(\frac{1}{2}\right)^x=\frac{1}{64}\)
\(\left(\frac{1}{2}\right)^x=\left(\frac{1}{2}\right)^6\)
=> x=6
\(\left(\frac{1}{2}\right)^x=\frac{1}{64}\Leftrightarrow\left(\frac{1}{2}\right)^x=\frac{1}{2^6}\)
\(\Leftrightarrow\left(\frac{1}{2}\right)^x=\left(\frac{1}{2}\right)^6\)
\(\Leftrightarrow x=6\)
vậy, x=6