Question

Fie U={0,1,2,3,4,5,6,7,8,9}.Scrieti prin enumerarea elementelor,mulțimile :a) A={x€U|√1x28/3€N}​

Answer 1

Răspuns:

A = {7}

Explicație pas cu pas:

U = {0,1,2,3,4,5,6,7,8,9}

                    ___

A={x ∈ U |√(1x28)/3 ∈ N}​

Elemente posibile :

√(1028/3) ∉ N ; √(1128/3) = √376 ∉ N ; √(1228/3) ∉ N ;

√(1328/3) ∉ N ; √(1428/3) = √476 ∉ N ; √(1528/3) ∉ N

√(1628/3) ∉ N ; √(1728/3) = √576 = 24 ∈ N

√(1828/3) ∉ N ; √(1928/3) ∉N =>

A = {7}