$lg ^{1}_{2} {x-1}+\lg ^{1}_{2} (x+1)-lg^{1}_{\sqrt{2}} (7-x)=1$

bị xóa vì bị trùng bởi pena831994@gmail.com, hoàng anh thọ 20-05-13 03:24 PM

Câu hỏi này có nội dung hoàn toàn trùng với câu hỏi đã có.

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