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kimsusu0987
2 năm trước
Cho hệ phương trình $\left \{ {{(m+2)x+(m^{2}+1)y=5} \atop {2x-y=2}} \right.$ Tìm m để nghiệm của hệ phương trình thỏa mãn A=xy-x²+3 đạt giá trị nhỏ nhất. Tìm giá trị nhỏ nhất ấy?
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