Решите неравенство:
а) х(х-2)(9-х)(х+4)≥0
б) (х+2)(х+3)/х-5 ≥0
в) 6/х²-6х < 1/х-6
г) (х-1)²(2х-1)(х+2)≤0
/ - это дробная черта...
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