Toán Lớp 9: 1. x^2 – 2 √2 x x – 7 = 0
2. Tìm x để √x -1 / √x+2 < 0
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Toán Lớp 9: 1. x^2 – 2 √2 x x – 7 = 0
2. Tìm x để √x -1 / √x+2 < 0
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