114. բ) (x — 8) * (x — 19) < 0

(x — 8) * (x — 19) = 0 = > [x = 8 = 0 = > [x = 8
[x — 19 = 0 [x = 19

x ∈ (8 ; 19)

գ) (x + 3) * (x — 5) < 0

(x + 3) * (x — 5) = 0 = > [x + 3 = 0 = > [x = -3
[x — 5 = 0 [x = 5

x ∈ (-3 ; 5)

115. ա) (2x — 1) * (3x + 5) < 0

(2x — 1)(3x + 5) = 0 = > [2x — 1 = > [x = 1/2
[3x + 5 [x = 5/3

x ∈ (-5/3 ; 1/2)

դ) (1 1/3x + 1/12) * (0,7x + 4) > 0

(1 1/3x + 1/12) * (0,7x + 4) = 0 => 11/3x + 1/12 = 0 = > [x = 1/12:4/3 = > [1/16
[x = -4 : 0,7 [40/7

x ∈ (1/16 ; 40/7)

116. ա) x² — x > 0
x² — x = 0 = > [x = 0 = > [x = 0
[x — 1 = 0 [x = 1

դ) 3x² — x < 0
x² — x = 0 = > [3x + 1 = 0 = > [x = -1/3
[x = 0 [x = 0