1/(n+1)*can n < 2/can n - 2/can(n+1)
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2
24 tháng 9 2017
\(n=\left(1+\sqrt{3}+\sqrt{5}\right)\left(1+\sqrt{3}-\sqrt{5}\right)\)
\(n=\left(1+\sqrt{3}\right)^2-\sqrt{5}^2\)
\(n=1+2.\sqrt{3}.1+3-25\)
\(n=4-25+2\sqrt{3}\)
\(n=-21+2\sqrt{3}\)
TH
14 tháng 1 2022
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