giúp mik ----- Nội dung ảnh ----- Câu 7: Thực hành rút gọn các biểu thức sau a) A = \(\frac{x^2-4}{x-2} + \frac{x^2-1}{x+1}\) b) B = \(\frac{x^2-2x-1}{x-1} - \sqrt{(x-1)^2}\) c) C = \(\frac{x^2-9}{x-3} - \frac{x^2-4x+3}{x-1}\) d) D = \(\frac{x^2+2x+1}{x+1} - \sqrt{x^2}\) e) E = \(\frac{x^2-1}{x-2} - \frac{x^2-4}{x-2}\) f) F = \(\frac{x^2-6x+9}{x-3} - \frac{x^2-1}{x-1}\) g) G = \(\frac{x^2-2x}{x} + \frac{x}{x+1}\) h) H = \(\frac{x^2-a^2}{x-a} + \frac{a^2-x^2}{x+a}\) i) I = \(\frac{(x+1)^2-1}{x+1}\) j) J = \(\frac{x^2+x}{x+1} - x\) k) K = \(\frac{x^2+2x+1}{x+1} - \frac{x^2-1}{x-1}\)
