Question

Não sei botar esses símbolos, mas tá ai a foto.

Answer 1

A={-7,-6,-5,-4,-3,-2,-1,0,1,2,3,4,5,6,7,8,9,10,11,12} e B={-2,-1,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14, 15,16,17,18,19}, logo; respostas: letra a) AUB= {XE|R| -7_< X _< 19} letra b) {XE|R| -2 _< X _< 12} letra c) A-B= {XE|R| -7 _< X _< -3} letra d) B-A= {XE|R| 13 _< X _< 19}