Mathematics, 20.06.2021 07:00 sarahelisabeth444

Biết rằng khi m thay đổi, giao điểm của hai đường thẳng y=3x-m-1 và y=2x+m-1 luôn nằm trên đường thẳng y=ax+b ( a, b thuộc R ). khi đó a+b=?

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Biết rằng khi m thay đổi, giao điểm của hai đường thẳng y=3x-m-1 và y=2x+m-1 luôn nằm trên đường thẳ...