Question

1:1-2х$geq$1

Answer 1

$frac{1}{1-2x} geq 1 \ 1 geq 1-2x \ 2x geq 0\x geq 0$
$1-2x neq 0 \ -2x neq -1 \ x neq 0.5$
x∈$[0;0.5)U(0.5;+infty)$