Ответ:
Объяснение:
1) 1 + 2x ≥ 9
2x ≥ 9 -1 → 2x ≥ 8
x ≥ 8/2 → x ≥ 4
3) 2(3 +x) + (4 - x) ≤ 0
6 +2x +4 -x ≤ 0 → x + 10 ≤ 0 → x ≤ - 10
5) 2x² - 3x ≥ 2(x - 1)
2x² - 3x -2x + 2 ≥ 0 → 2x² -5x +2 ≥ 0
2x² - 4x - x + 2 ≥ 0
2x(x - 2) - (x - 2) ≥ 0
(2x - 1)(x - 2) ≥ 0
1) {2x - 1 ≥ 0 → { 2x ≥ 1 → {x ≥ 1/2
{x - 2 ≥ 0 → {x ≥ 2 → {x ≥2
2) {2x - 1 ≤ 0 → {x ≤ 1/2 → {x ≤ 0,5
{x - 2 ≤ 0 → { x ≤ 2 → {x ≤ 2Ответ: x ∈ [ 0,5; 2]
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Answers & Comments
Ответ:
Объяснение:
1) 1 + 2x ≥ 9
2x ≥ 9 -1 → 2x ≥ 8
x ≥ 8/2 → x ≥ 4
3) 2(3 +x) + (4 - x) ≤ 0
6 +2x +4 -x ≤ 0 → x + 10 ≤ 0 → x ≤ - 10
5) 2x² - 3x ≥ 2(x - 1)
2x² - 3x -2x + 2 ≥ 0 → 2x² -5x +2 ≥ 0
2x² - 4x - x + 2 ≥ 0
2x(x - 2) - (x - 2) ≥ 0
(2x - 1)(x - 2) ≥ 0
1) {2x - 1 ≥ 0 → { 2x ≥ 1 → {x ≥ 1/2
{x - 2 ≥ 0 → {x ≥ 2 → {x ≥2
2) {2x - 1 ≤ 0 → {x ≤ 1/2 → {x ≤ 0,5
{x - 2 ≤ 0 → { x ≤ 2 → {x ≤ 2
Ответ: x ∈ [ 0,5; 2]