Question

scrieți mulțimea enumerând elementele :
a) {xe N \ x <= 3 }
b) B= {X E N\ 2 < x<= 7}
c) C={ xE N\ x+1 <= 4}
d) D= {xE N \ 3 <= x-2 <= <= 8 }
e) E= {xE\4 <= x+2 <= 10}

Answer 1

a)A={.......-4,-3,-,2,-1,0,1,2,3}
b)B=1,0,1,2,3,4,5,6,7}
c)x+1≤4
x≤4-1
x≤3
C={........-4,-,3,-2,-1,0,1,2,3}
d)3<x-2
-x<-2-3
-x<-5    (-1)
x>5
x-2≤8
x≤8+2
x≤10
D={6,7,8,9,10}
e) 4<x+2
-x<2-4
-x<-2     (-1)
x>2
x+2≤10
x≤10-2
x≤8
E={3,4,5,6,7,8}