Question

10 баллов помогите решить!!

Answer 1

(1/2)^-3х=>1/2
-3х <= 1
х => -(1/3)

Answer 2

$2^{3x} \geq \frac{1}{2} \\\\2^{3x} \geq 2^{-1}\\\\3x \geq -1\\\\x \geq - \frac{1}{3} \\\\x\in [-\frac{1}{3}\, +\infty )$