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tettrungthu17896


Cho dãy [TEX]{a}_{1}=\frac{1}{2} ; {a}_{n+1}=\frac{{a}_{n}^2}{{a}_{n}^2-{a}_{n}+1}[/TEX]
CMR:[TEX]{a}_{1}+{a}_{2}+{a}_{3}+...+{a}_{n}<1[/TEX]
CMR:[TEX]{a}_{1}+{a}_{2}+{a}_{3}+...+{a}_{n}<1[/TEX]
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