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Cho hai phân số 7/11 và 1/5. Hãy tìm phân số a/b sao cho đem mỗi phân số đã cho cộng phân số a/b thì được hai phân số mới có tỉ số là 3. Giúp nha, ai nhanh, hay đầy đủ thì mình chọn CTLHN.
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