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KatyaTelinova
@KatyaTelinova
July 2022
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Regent1828
Verified answer
1) 5x² - 8x + 3 ≤ 0 D = b²-4ac = 64 - 60 = 4
x₁ = (-b+√D)/2a = (8+2)/10 = 1
x₂ = (-b -√D)/2a = (8 - 2)/10 = 0,6
5(x - 1)(x - 0,6) ≤ 0
x - 1 ≤ 0 x - 1 ≥ 0
x - 0,6 ≥ 0 x - 0,6 ≤ 0
x ≤ 1 x ≥ 1
x ≥ 0,6 x ≤ 0,6
[0,6; 1] ∅
Ответ: х∈[0,6; 1]
2)
x + 2 > 0 x + 2 <0 ОДЗ: х ≠ 2
x - 2 > 0 x - 2 < 0
x > -2 x < -2
x > 2 x < 2
(2; ∞) (-∞; -2)
Ответ: (-∞; -2)∪(2; ∞)
3) ОДЗ: 5х ≠ 4
х ≠ 0,8
4) ОДЗ: 8х ≠ 10
х ≠ 1,25
Ответ: x∈(1,25; ∞)
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Answers & Comments
Verified answer
1) 5x² - 8x + 3 ≤ 0 D = b²-4ac = 64 - 60 = 4x₁ = (-b+√D)/2a = (8+2)/10 = 1
x₂ = (-b -√D)/2a = (8 - 2)/10 = 0,6
5(x - 1)(x - 0,6) ≤ 0
x - 1 ≤ 0 x - 1 ≥ 0
x - 0,6 ≥ 0 x - 0,6 ≤ 0
x ≤ 1 x ≥ 1
x ≥ 0,6 x ≤ 0,6
[0,6; 1] ∅
Ответ: х∈[0,6; 1]
2)
x + 2 > 0 x + 2 <0 ОДЗ: х ≠ 2
x - 2 > 0 x - 2 < 0
x > -2 x < -2
x > 2 x < 2
(2; ∞) (-∞; -2)
Ответ: (-∞; -2)∪(2; ∞)
3) ОДЗ: 5х ≠ 4
х ≠ 0,8
4) ОДЗ: 8х ≠ 10
х ≠ 1,25
Ответ: x∈(1,25; ∞)