Cho hai đường thẳng (d1) y = -3x +m +1 (d2) y = (2k + 6)+2-m (k khác -3) Xác định k và m để a) hai đường thẳng trùng nhau b) hai đường thẳng song song c) hai đường thẳng cắt nhau d) hai đường thẳng vuông góc với nhau

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