1)0.8x(5x - 0.8) + 0.04x ≤ 4x^2 - 124x^2 - 0.64x + 0.04x ≤ 4x^2 - 12-0.60x ≤ -12x ≥ 20
2)(1.8x + 1)(5x - 1) - 2.2x > 9x^2 - 49x^2 - 1.8x + 5x - 1 - 2.2x > 9x^2 - 49x^2 + 3.2x - 1 > 9x^2 - 43.2x - 1 > -43.2x > -3x > -0.9375
Ответ:1) x ≥ 202) x > -0.9375
1)
0.8x(5x - 0.8) + 0.04x ≤ 4x^2 - 12
4x^2 - 0.64x + 0.04x ≤ 4x^2 - 12
-0.60x ≤ -12
x ≥ 20
2)
(1.8x + 1)(5x - 1) - 2.2x > 9x^2 - 4
9x^2 - 1.8x + 5x - 1 - 2.2x > 9x^2 - 4
9x^2 + 3.2x - 1 > 9x^2 - 4
3.2x - 1 > -4
3.2x > -3
x > -0.9375
Ответ:
1) x ≥ 20
2) x > -0.9375