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	Các bình luận về: Đề bài: Phương trình \({\left( {3 + \sqrt 5 } \right)^x} + {\left( {3 &#8211; \sqrt 5 } \right)^x} = {3.2^x}\) có hai nghiệm \({x_1},x{ _2}\). Tính \(A = x_1^2 + x_2^2.\)	</title>
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