Question

Fie multimile :

A=[x|x∈N*x+1<3]
B=[y\y∈N*,y≤4]si
C=[z\z∈N*,6<3(x+2)≤9]
A,B,C=
A∪B∪C=
A∩B∩C=

Answer 1

A={1}
B={1;2;3;4}
6<3(x+2)<=9
6<3x+6<=9
0<3x<=3
0<x<=1
C={1}
AuBuC={1;2;3;4}
AnBnC={1}

Answer 2

A=(1,2)
B=(1,2,3,4)
C=(1,2,3,4,5,6,7)
A∪B∪C=(1,2,3,4)∪C=(1,2,3,4,5,6,7)
A∩B∩C=(1,2)∩C=(1,2)