Ответ

Автор - julyap
 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) 

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