Bài tập 1: Tính các giới hạn sau đây: a) A = \(\lim_{x \to +\infty} \frac{2x^3 - 3x^2 + 4x + 1}{x^4 - 5x^3 + 2x^2 - x + 3}\) b) B = \(\lim_{x \to +\infty} \frac{x + \sqrt{x^2 + 2}}{\sqrt[3]{8x^3 + x^2} + 1}\) c) C = \(\lim_{x \to +\infty} \left(\sqrt{x + \sqrt{x} - \sqrt{x}}\right)\) d) D = \(\lim_{x \to +\infty} x\left(\sqrt{x^2 + 1} - x\right)\) e) E = \(\lim_{x \to +\infty} \frac{3x^2 - x + 7}{2x - 1}\) f) F = \(\lim_{x \to +\infty} \frac{2x^3 + 3x - 4}{-x^3 - x^2 + 1}\) g) G = \(\lim_{x \to +\infty} \frac{3x^2 - x + 3}{x - 4}\) h) H = \(\lim_{x \to +\infty} \frac{2x^3 - 2x + 3}{5 - x}\)