Question

Известно, что 4 1) -8<13-3b<1 2)1 1 1 _ < ____ < _ 9 2b-5 3

Answer 1

$-8\ \textless \ 13-3b\ \textless \ 1\\ -8-13\ \textless \ -3b\ \textless \ 1-13\\ -21\ \textless \ -3b\ \textless \ -12 \ |:(-3)\\ 4\ \textless \ b\ \textless \ 7\\ x \ e\ (4; 7)\\ \\ \frac19\ \textless \ \frac1{2b-5}\ \textless \ \frac13\\ 9\ \textgreater \ 2b-5\ \textgreater \ 3\\ 3\ \textless \ 2b-5\ \textless \ 9\\ 3+5\ \textless \ 2b\ \textless \ 9+5\\ 8\ \textless \ 2b\ \textless \ 14 \ |:2\\ 4\ \textless \ b\ \textless \ 7\\ x \ e (4;7)$