Ответ:
1) x∈(-∞; +∞), x 0
2) x∈(-∞; +∞), x 12
3) x∈(-∞; +∞), x -9
4) x∈(-∞; +∞), x ±4
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Ответ:
1) x∈(-∞; +∞), x 0
2) x∈(-∞; +∞), x 12
3) x∈(-∞; +∞), x -9
4) x∈(-∞; +∞), x ±4