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chucnguyen.18012001
2 năm trước
Tìm m để a) f(x)= x² - 2(m-2)x + 7 - 2m > 0, ∀x ∈ R b) f(x)= -x² - 2(m+1)x -2m - 2 ≤ 0, ∀x ∈ R c) f(x)= mx² - 2(m+3)x +m - 6 > 0, ∀x ∈ R giúp e vs ạ
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