Rút gọn : a) \(A = \frac{1}{{\sqrt 5 – 1}} + \frac{1}{{\sqrt 5 + 1}}\) b) \(B = \frac{1}{{\sqrt 1 + \sqrt 2 }} + \frac{1}{{\sqrt 2 + \sqrt 3 }} + … + \frac{1}{{\sqrt {99} + \sqrt {100} }}\) A a)\(A=\frac{\sqrt{5}}{2}\) b) B=10 B a)\(A=\frac{\sqrt{7}}{2}\) b) B=9 C a)\(A=\frac{\sqrt{5}}{2}\) b) B=9 D a)\(A=\frac{\sqrt{5}}{3}\) b) B=9
Rút gọn : a) \(A = \frac{1}{{\sqrt 5 – 1}} + \frac{1}{{\sqrt 5 + 1}}\) b) \(B = \frac{1}{{\sqrt 1 + \sqrt 2 }} + …