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	Các bình luận về: 15. Biết \(\int\limits_1^2 {\frac{{2x + 1}}{{{x^2} + x + 1}}{\rm{d}}x}&#160; = \ln \frac{a}{b}\) với \(a,b\) là các số nguyên dương và phân số \(\frac{a}{b}\) tối giản. Tính \(T = a + b\).	</title>
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