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Cho hàm số bậc nhất y=f(x)=(6-3a)x+a-6 A. với giá trị nào của a thì hàm số đồng biến , nghịch biến trên tập hợp số thực R B. Biết f(2)=0 hàm số đồng biến hay nghịch biến C.Biết f(-1)=8 hàm số đồng biến hay nghịch biến
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