Cho bất phương trinh : $(2m^{2}$-3m-2)$x^{2}$+2(m-2)x-1$\leq$0 (1)
bỏ qua trường hợp a = 0 thì  là tam thức bậc hai nên f(x) luôn cùng dấu với a. Vậy tai sao là $\triangle$ $\leq$ 0 chứ không phải là a $\leq$ 0 ( đúng ra là a < 0 )

bị xóa vì bị trùng bởi Đức Vỹ 24-10-13 05:13 PM

Câu hỏi này có nội dung hoàn toàn trùng với câu hỏi đã có.

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