Question

Решите неравенство:
$(\frac{2}{5})^{x} \leq 1$

Answer 1

$(\frac{2}{5})^{x}\leq 1\\\\(\frac{2}{5})^{x}\leq (\frac{2}{5})^0\\\\tak\; kak\; \; 0<\frac{2}{5}<1\; ,\; \; to\; \; x\geq 0$

Ответ:   $x\geq 0$ .