Решите квадратные неравенства построив схематически параболу :
1. х² - 2х - 15≤ 0
2. -2х² - 5х +3 < 0
3. 3х² – 4х +7 ≥ 0
4. х² – 4х + 5 < 0
5. х² – 6х + 9 < 0
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