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Bài 4 : Cho hai hàm số bậc nhất y = 2x + 3k và y = ( 2m + 1)x + 2k – 3 Tìm điều kiện của k và m để đồ thị hai hàm số sau là : a. Cắt nhau b. Song song c. Trùng nhau d. Vuông góc giúp mik mn ưi
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