Решите квадратные неравенства
a) x²-2x-8 ≤ 0
б) 2x²-5x+3 ≥0
в)x²-1 ≤ 0

Решите неравенства используя метод интервалов
a) (x-5) (x+3)≥0
Б) 2х+4/x-6≤0
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