若x^2-2x-2=0,则2x^2-4x+3=

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若x^2-2x-2=0,则2x^2-4x+3=若x^2-2x-2=0,则2x^2-4x+3=若x^2-2x-2=0,则2x^2-4x+3=由条件可知x²-2x=2,则,2x²-4x

若x^2-2x-2=0,则2x^2-4x+3=
若x^2-2x-2=0,则2x^2-4x+3=

若x^2-2x-2=0,则2x^2-4x+3=
由条件可知x²-2x=2,
则,2x²-4x+3
=2(x²-2x)+3
=2×2+3
=7