1)-3 \\\\\\\\\\\\\\\\\\\\\\\\
-------------------------o-----------------------> x
-3
x∈(-3; + бесконечность)
2)-2<</u>9
\\\\\\\\\\\\\\\\\\\\\
//////////////////////////
--------------о-----------o-----------------------> x
-2 9
х∈(-2; 9]
3)-2 ////////////////////////
-------------------------o-----------------------> x
-2
x∈(-2; + бесконечность)
4)-5<</u>7
\\\\\\\\\\\\\\\\\\\\\\\\\\
////////////////////////////
--------------о-----------o-----------------------> x
-5 7
х∈(-5; 7]