При каких значениях x верно равенство:
а) $2^x = 1$;
б) $5^{x - 3} = 1$;
в) $(\frac{1}{3})^x = 1$;
г) $(\frac{7}{9})^{x + 5} = 1$?
$2^x = 1$
x = 0
$2^0 = 1$
$5^{x - 3} = 1$
x − 3 = 0
x = 3
$5^{3 - 3} = 1$
$(\frac{1}{3})^x = 1$
x = 0
$(\frac{1}{3})^0 = 1$
$(\frac{7}{9})^{x + 5} = 1$
x + 5 = 0
x = −5
$(\frac{7}{9})^{-5 + 5} = 1$