2x-2 < 0 (2x-4).(9-3x)>0 2x/3 - 3/4 >0 (3/4 - 2x) . (-3/5 + 2/-61 - 17/51) < hoặc = 0 (3/2x - 4) . 5/3 >15/6

a) 2x-2< 0

2x-0 + 2

2x < 2

⇒ x < 1

b) (2x-4). (9-3x) > 0

30x - 6x² - 36 > 0

-6x² + 30x -36 > 0

6x² - 30x + 36 < 0

6 ( x-3). ( x-2 ) < 0

⇔ x <3; x > 2

2 < x < 3

x ∈ ∅

c) 2x/3 - 3/4 > 0

2x - 9/4 > 0

2x > 0 + 9/4

2x > 9/4

x > 9/8

d) ( 3/4 - 2x ).( -3/5 + 2/-61 - 17/51) < hoặc = 0

⇔ ( 3/4 - 2x ) . ( -884/915 ) ≤ 0; 3/4= 2x ≥ 0

                                                            ⇒ x ≤ 3/8

Vậy x ∈ ( ∞; 3/8 )

e) (3/2x -4) . 5/3 > 15/6

⇔ 3/2x - 4 > 3/2 ⇔ 3/2x > 11/2

⇔ 3/2x - 11x/ 2x > 0; 3-11x/2x >0

Vậy x ∈ ( 0; 3/11 )

#Tham khảo nha bạn!