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	Các bình luận về: Biết rằng bất phương trình \(\left( {{3^{{x^2} &#8211; 2x}} &#8211; {3^{2x &#8211; 4}}} \right)\left( {{3^{{x^2} &#8211; 2}} &#8211; {3^{6x &#8211; 7}}} \right) \le {\left( {\frac{1}{{\sqrt 3 }}} \right)^{10 &#8211; 4x}} &#8211; {3^{{x^2} &#8211; 4x}}\) có tập nghiệm là \(S = \left[ {a;b} \right]\). Tính tổng \(a + b\).
A. \(7\).	B. \(5\).	C. \(4\).	D. \(6\).	</title>
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