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Oni Rgine
6 tháng trước

Các bạn giúp mk với. Mk dg cần gấp lắm Đề bài:Cho: x²-2mx+2m-3=0 Tìm m để phương trình có nghiệm kép

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Đại Chi
6 tháng trước

Đáp án:

Ta có : `a=1⇒` Phương trình là phương trình bậc `2` 1 ẩn.

Để phương trình có nghiệm kép :

`Δ'=(-m)^(2)-1.(2m-3)=0`

`⇔m^(2)-2m+3=0`

Ta có : `m^(2)-2m+3`

`⇔m^(2)-2m+1+2`

`⇔(m-1)^(2)+2≥2>0`

Vậy không tìm được `m` thỏa mãn để phương trình có nghiệm kép.

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