Question

Stabiliti valoarea de adevar a propozitiilor

a) -5∈[-7;1) sau -5∈[0;7)
b) -1∈(-3;-1] si -1∈(-2;2)
c)2∈(-3,3) sau 2∈[1;11)
d)1∈(-2;1) si 1∈(0;5]

Answer 1

a) -5€[-7,1) deoarece
[-7,1)={-7,-6,-5,-4,-3,-2,-1,0}

b) ambele sunt adevarate
(-3,-1]={-2,-1}
(-2,2)={-1,0,1}
c) ambele sunt adevarate
(-3,3)={-2,-1,0,1,2}
[1,11)={1,2,3,4,5,6,7,8,9,10}
d) 1€(0,5] deoarece
(0,5]={1,2,3,4,5}