13.11. Решите неравенство:
1) 0,8х (5х – 0,8) +0,04x < 4х2 - 12;
2) 9х2 - 11> 9х (х-2) - 3;
3) (4x - 5) (6 - 3х) - 4< (1 - 2x) (7 + 6x);
4) (1,8х + 1) (5х-1) - 2,2x > 9х2 - 4.
1) 0,8х (5х – 0,8) +0,04x < 4х2 - 12;
2) 9х2 - 11> 9х (х-2) - 3;
3) (4x - 5) (6 - 3х) - 4< (1 - 2x) (7 + 6x);
4) (1,8х + 1) (5х-1) - 2,2x > 9х2 - 4.
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