Помогите. очень важно..

11. 2,4·10⁻³ · 2·10⁻² = 4,8·10⁻⁵ = 0,000048 --- (Б) 12. 2x - 3(x + 4) < x + 12 2x - 3x - 12 < x + 12 -x - 12 < x + 12 2x > -24 x > -12 --- (A) 14. nx² + 8x + 8 = 0 D = 64 - 32n 64 - 32n < 0 32n > 64 n > 2 --- (A) 15. [latex]\frac{x^2-3}{x^2-x} - \frac{x}{x-1} =\frac{x^2-3}{x(x-1)} - \frac{x}{x-1}=\frac{x^2-3-x^2}{x(x-1)}=-\frac{3}{x^2-x}[/latex] --- (A)