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	Các bình luận về: Đề bài: Cho \(\int_1^3 {\frac{{{\rm{d}}x}}{{\left( {x + 1} \right)\left( {x + 4} \right)}}}  = a\ln 2 + b\ln 5 + c\ln 7\,\,\,\left( {a,b,c \in \mathbb{Q}} \right)\). Tính \(S = a + 4b &#8211; c\)	</title>
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