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thanhxuanqhqn
2 năm trước
$\left \{ {{3x+(m-2)y=12} \atop {(m-2)x+12y=24}} \right.$ a)tìm m để hệ có nghiệm duy nhất thỏa mãn x+y=-1 b)tìm m nguyên dể hệ có nghiệm nguyên
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