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phgamer17122009
2 năm trước
Định m để hệ PT ẩn x,y: $\left \{ {{(m-1)x-my=3m-1} \atop {2x-y=m+5}} \right.$ có nghiệm duy nhất (x;y) mà x^2+y^2 đạt giá trị nhỏ nhất
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