Question

Fie A={x€Z|5/2x-1€Z}si
B={x€Z|-2 2x +5}

Answer 1

A={0,1,3}

-2<2x+5
2x<-2-5
2x<-7
x<-7/2 (mai mic sau egal)
x€ (-infinit, -3,5]

2x+5<3
2x<3-5
2x<-2
x<-1
x€ (-infinit, -1)
B={-3,-2,-1,0}
AΠB= {0}