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Vkiu2503
2 năm trước
Cho hệ phương trình x+y=3 và 2x-y=0 (1) 1.giải hệ phương trình (1)vơia m=-7 2.Xác định giá trị của m để: a)x=-1và y=4là nghiệm của hệ pt (1) b)hệ (1) có 1 nghiệm duy nhất
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