Γ 1) 5x-15<0 5x<0+15:5 X<3 XE(-∞;3) 2) 6+2x>0 2x>0-6 x>-3 XE (-3; +00) 3) 7x-42>0 4)-5-10x≤0 5) 5x+9≥0 6)-4x-1≤0 7) 3-4x<0 8) 3x-0,3≤0 9) 11x+1,1>0

Ответ:

1. 1) 5x - 15 < 0

   5x < 15 | : 5

   x < 3

   x ∈ (-∞; 3)

2. 2) 6 + 2x > 0

   2x > -6 | : 2

   x > -3

   x ∈ (-3; +∞)

3. 3) 7x - 42 > 0

   7x > 42 | : 7

   x > 6

   x ∈ (6; +∞)

4. 4) -5 - 10x ≤ 0

   -10x ≤ 5 | : (-10)

   x ≥ -0.5

   x ∈ [-0.5; +∞)

5. 5) 5x + 9 ≥ 0

   5x ≥ -9 | : 5

   x ≥ -1.8

   x ∈ [-1.8; +∞)

6. 6) -4x - 1 ≤ 0

   -4x ≤ 1 | : (-4)

   x ≥ -0.25

   x ∈ [-0.25; +∞)

7. 7) 3 - 4x < 0

   -4x < -3 | : (-4)

   x > 0.75

   x ∈ (0.75; +∞)

8. 8) 3x - 0.3 ≤ 0

   3x ≤ 0.3 | : 3

   x ≤ 0.1

   x ∈ (-∞; 0.1]

9. 9) 11x + 1.1 > 0

   11x > -1.1 | : 11

   x > -0.1

   x ∈ (-0.1; +∞)

Ответ: