1)-2х²+9x-7<0
-2(x-7/2)(x-1)<0
x>7/2 x<1
2)4х²+4x+1≤0
(2x+1)²≤0
x=-1/2
3) 4х^2 ≥ 9х
4x²-9x≥0
x(4x-9)≥0
x≤0 x≥9/4
4) х² < 121
x²-121<0
(x-11)(x+11)<0
-11<x<11
5) (3x-1)(x+4)(x-6) ≥ 0
-4≤x≤1/3 x≥6
1)-2х²+9x-7<0
-2(x-7/2)(x-1)<0
x>7/2 x<1
2)4х²+4x+1≤0
(2x+1)²≤0
x=-1/2
3) 4х^2 ≥ 9х
4x²-9x≥0
x(4x-9)≥0
x≤0 x≥9/4
4) х² < 121
x²-121<0
(x-11)(x+11)<0
-11<x<11
5) (3x-1)(x+4)(x-6) ≥ 0
-4≤x≤1/3 x≥6