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kimphuong1032


Cho A = $\frac{1}{\sqrt1 + \sqrt2} + \frac{1}{\sqrt2 + \sqrt3} + \frac{1}{\sqrt3 + \sqrt4} + ... + \frac{1}{\sqrt{24} + \sqrt{25}}$
B = $\frac{1}{\sqrt1} + \frac{1}{\sqrt2} + \frac{1}{\sqrt3} + ... + \frac{1}{\sqrt{24}}$
a) Rút gọn A
b) C/m B>8
Giúp mình câu b)
Thanks
B = $\frac{1}{\sqrt1} + \frac{1}{\sqrt2} + \frac{1}{\sqrt3} + ... + \frac{1}{\sqrt{24}}$
a) Rút gọn A
b) C/m B>8
Giúp mình câu b)