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intersecția intervalelor (-infinit;3]si(1, infinit) este intervalul

Răspuns :

(-infinit;3] intersectat cu (1; +infinit) = (+1;+3]

-∞ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\+3]
____________________________|____________
                                      |                                       +∞
                                  (+1 ////////////////////////////////////////)

(-∞ ; +3]  ∩  (+1 ; +∞) =  ( +1 ; +3 ]