Выполните почленное сложение верных числовых равенств: 5 меньше 9 и 3меньше4 3 больше 1 и...

Решите задачу:

$\left \{ {{5\ \textless \ 9} \atop {3\ \textless \ 4}} \right. 8\ \textless \ 13\\ \left \{ {{3\ \textgreater \ 1} \atop {5\ \textgreater \ -2}} \right. 8\ \textgreater \ -1\\ \left \{ {{2\ \textless \ 3} \atop {4\ \textless \ 7}} \right. 6\ \textless \ 10\\ \left \{ {{4.2\ \textgreater \ 3} \atop {5\ \textgreater \ -1}} \right. 7.2\ \textgreater \ 2\\ \left \{ {{0.3\ \textless \ 1.2} \atop {4\ \textless \ 5}} \right. 4.3\ \textless \ 6.2\\ \left \{ {{1.8\ \textgreater \ 1} \atop {2\ \textgreater \ 0.8}} \right. 3.8\ \textgreater \ 1.8$