
- - +
__________[0]___________[1 2/3]____________
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x ∈ 0 ; [1 2/3 ; + ∞)

Заменим частное произведением :
(x² - 9)(2x + 5) ≤ 0
2(x - 3)(x + 3)(x + 2,5) ≤ 0
(x - 3)(x + 3)(x + 2,5) ≤ 0 , x ≠ - 2,5
- + - +
_________[- 3]__________(- 2,5)___________[3]_____________
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x ∈ (- ∞ ; - 3] ∪ (- 2,5 ; 3]