Răspuns:
10.
a)
6:(9-x)<1 => (9-x) >6 => -x>-3=> x<3
x∈( 0, 1 , 2)
b) 14: (x+8) <1 =>( x+8) > 14=> x>6
x∈ ( 6, ∞) ∩ N
c) (x+7 ) < 13 => x<6
x∈ ( 0, 1, 2, 3, 4, 5)
d)
(x-9)<12 =>x<21
x∈ ( 0, 1, 2, 3, 4, 5, 6, ....., 20)
11. a) -9/10
b) -2/3
c) -6/7
d) -8/9
