Răspuns:
Explicație pas cu pas:
x+5<4
x<4-5
x< -1
S={ -2,-3,-4,-5,.....-inf}
b) 2x+1 > 20
2x > 19
x>19/2
x > 9,5
S={10,11,12,13....}
c) -3x ≤ -9
x ≥ 3
S={3,4,5,6...}
d) 4x ≥ 0
x ≥0
S={0,1,2,3...}
1.1. a
1.2.a,b,c