Решите неравенство -3(2x+1)(5x-4)>0
- 3 (2x + 1)(5x - 4) > 0 /:(-3) (2x + 1)(5x - 4) < 0 2x + 1 = 0 2x = - 1 x = - 0,5 5x - 4 = 0 5x = 4 x = 0,8 + - + -------------- - 0, 5 ------------------ 0, 8 ---------------> x x ∈ ( - 0,5; 0,8)