`Delta=(2m-1)^2-8(m-1)`
`=4m^2-4m+1-8m+8`
`=4m^2-12m+9`
`=(2m-3)^2>=0(AA m)`
Vi-ét:
`x_1+x_2=(1-2m)/2,x_1.x_2=(m-1)/2`
`4x_1+4x_2^2+2x_1x_2=1`
`<=>(2x_1+2x_2)^2-6x_1x_2=1`
`<=>(2m-1)^2-3(m-1)-1=0`
`<=>4m^2-4m+1-3m+3-1=0`
`<=>4m^2-7m+3=0`
`<=>m=1\or\m=3/4`