PT có 2 nghiệm phân biệt
`<=>Delta>0`
`<=>m^2-8(m-2)>0`
`<=>m^2-8m+16>0`
`<=>(m-4)^2>0`
`<=>m-4 ne 0`
`<=>m ne 4`
`a+b+c=2-m+m-2=0`
`<=>` \(\left[ \begin{array}{l}x=1\\x=\dfrac{m-2}{2}\end{array} \right.\)
`|x_1+2|+|x_2-1|=3`
Nếu `x_1=(m-2)/2,x_2=1`
`<=>|(m-2)/2+2|+|1-1|=3`
`<=>|(m-2+4)/2|=3`
`<=>|m+2|=6`
`<=>` \(\left[ \begin{array}{l}m=4(l)\\m=-8(tm)\end{array} \right.\)
Nếu `x_1=1,x_2=(m-2)/2`
`<=>|1+2|+|(m-2)/2-1|=3`
`<=>|(m-2-2)/2|=3-3=0`
`<=>m-4=0<=>m=4(l)`
Vậy `m=-8` thì ....
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