tìm m để bất phương trình vô nghiệm:$(m+2)x^{2}-2(m-1)x +4<0$

Câu hỏi này được treo giải thưởng trị giá +1000 vỏ sò bởi Tử Y Giáo Chủ, đã hết hạn vào lúc 16-05-18 09:35 PM

cố lên

A ≠ 0    ó m  ≠ 2                                ó m ≠ 2
 ▲’ < 0       (m – 1)^2 – (m+2) . 4 < 0      m^2 – 2m + 1 – 4m – 8 < 0
ó m ≠ 2                   ó m ≠ 2
     m^2 – 6m – 7 <0      -1 < x < 7
vậy m Є ( - 1 ; 7 )  ≠ 2
chúc may mắn

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