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\(\sqrt{2\sqrt{3\sqrt{4...\sqrt{2000}}}}=\sqrt{2\sqrt{3\sqrt{4...\sqrt{1999\sqrt{2000}}}}}\)
\(< \sqrt{2\sqrt{3\sqrt{4...\sqrt{1999.2001}}}}< \sqrt{2\sqrt{3\sqrt{4...\sqrt{1998.\frac{1999+2001}{2}}}}}\)
\(< \sqrt{2\sqrt{3\sqrt{4...\sqrt{1998.2000}}}}< ...< \sqrt{2.\frac{3+5}{2}}\)
\(=\sqrt{2.4}=\sqrt{8}< 3\)
\(\sqrt{2\sqrt{3\sqrt{4...\sqrt{1999\sqrt{2000}}}}}< \sqrt{2\sqrt{3\sqrt{4...\sqrt{1999.2001}}}}\)
\(< \sqrt{2\sqrt{3\sqrt{4...\sqrt{1998.2000}}}}< ...< \sqrt{2.4}< 3\)
Ta có:
\(\sqrt{2\sqrt{3\sqrt{4....\sqrt{2017}}}}\)
< \(\sqrt{2\sqrt{3\sqrt{4...\sqrt{2016\sqrt{2018}}}}}\)
\(=\sqrt{2\sqrt{3\sqrt{4...\sqrt{2017^2-1}}}}\)
< \(\sqrt{2\sqrt{3\sqrt{4...\sqrt{2015.2017}}}}\)
.......................................................................
< \(\sqrt{2.4}< \sqrt{9}=3\)
Ta có:
\(\sqrt{2\sqrt{3\sqrt{4...\sqrt{2000}}}}\)
\(< \sqrt{2\sqrt{3\sqrt{4...\sqrt{2000.2002}}}}\)
\(=\sqrt{2\sqrt{3\sqrt{4...\sqrt{1999\sqrt{2001^2-1}}}}}\)
\(< \sqrt{2\sqrt{3\sqrt{4...\sqrt{1999.2001}}}}\)
\(........................................\)
\(< \sqrt{2.4}=\sqrt{8}< 3\)
Ta có:
√2√3√4...√2000
<√2√3√4...√2000.2002
=√2√3√4...√1999√20012−1
<√2√3√4...√1999.2001
........................................
<√2.4=√8<3