978. Решите систему неравенств:

a) $$0.4x - 1 ≤ 0, 2.3x ≥ 4.6 → x ≤ 2.5, x ≥ 2 → 2 ≤ x ≤ 2.5$$.

б) $$0.3x > 4, 0.2x + 1 < 6 → x > 40/3, 0.2x < 5 → x > 13.33, x < 25 → 13.33 < x < 25$$.

в) $$0.7x - 2.1 < 0, 2/3 x > 1 → 0.7x < 2.1, x > 3/2 → x < 3, x > 1.5 → 1.5 < x < 3$$.

г) $$5/6 x - 10 ≤ 0, 3x < 1 rac{1}{3} → 5/6 x ≤ 10, 3x < 4/3 → x ≤ 12, x < 4/9 → x < 4/9$$.