L
le_ngoc_hieu_295


a,chứng minh:
[TEX]\frac{1}{2}+\frac{1}{3\sqrt{2}}+\frac{1}{4\sqrt{3}}+.....+\frac{1}{2005\sqrt{2004}}<2[/TEX]
b,chứng minh:
[TEX]\frac{1}{\sqrt{2}}+\frac{1}{\sqrt{3}}+\frac{1}{2}+.....+\frac{1}{\sqrt{225}}<28[/TEX]
[TEX]\frac{1}{2}+\frac{1}{3\sqrt{2}}+\frac{1}{4\sqrt{3}}+.....+\frac{1}{2005\sqrt{2004}}<2[/TEX]
b,chứng minh:
[TEX]\frac{1}{\sqrt{2}}+\frac{1}{\sqrt{3}}+\frac{1}{2}+.....+\frac{1}{\sqrt{225}}<28[/TEX]
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