Question

Срочно нужно
7^(1/2log(81)7)

Answer 1

$7^{\frac{1}{2\, log_{81}7}}=7^{\frac{1}{2}\cdot \frac{1}{log_{81}7}}=\Big (7^{\frac{1}{log_{81}7}}\Big )^{\frac{1}{2}}=\Big (7^{log_781}\Big )^{\frac{1}{2}}=81^{\frac{1}{2}}=\sqrt{81}=\sqrt{9^2}=9$