Question

Rút gọn :
B = \(\frac{x+\sqrt{5}}{x^2+2\sqrt{5}x+5}\)

Answer 1

\(\frac{x+\sqrt{5}}{x^2+2\sqrt{5}x+5}=\frac{x+\sqrt{5}}{\left(x+\sqrt{5}\right)^2}=\frac{1}{x+\sqrt{5}}\)

Answer 2

\(B=\frac{x+\sqrt{5}}{x^2+2\sqrt{5}x+5}=\frac{x+\sqrt{5}}{\left(x+\sqrt{5}\right)^2}=\frac{1}{x+\sqrt{5}}=\frac{x-\sqrt{5}}{x^2-5}\)