Question

Se considera multimea:A={x€Z|-2_<3x+1_<8}
Determinati A intersectat cu N
cum rezolv problema dau coroana

Answer 1

A={x∈Z|-2<3x+1<8}
-2<3x+1<8 |-1
-3<3x<7 |/3
-1<x<7/3
Dar x∈Z ⇒x∈{0;1;2}
A={0;1;2}
A∩N={0;1;2}