câu 1/ tìm tọa độ giao điểm của đường thẳng y=2x+3 và đường thẳng y=2x. có nhận xét câu 2/ cho đường thẳng (d): y=(m+4)x-m+6, chứng minh rằng : khi m thay đổi thì (d) luôn đi qua 1 điểm cố định

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