261. Определите знаки корней уравнения:
[tex]1) {x}^{2} - x - 12 = 0 \\ 2) {x}^{2} + 5x + 6 = 0 \\ 3) {x}^{2} - 15x + 16 = 0 \\ 4) - {x}^{2} + 2x + 24 = 0.[/tex]
помогите пожалуйста срочно​
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