若x2-2x+1=0,则2x2-4x=______.
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若x2-2x+1=0,则2x2-4x=______.
![若x2-2x+1=0,则2x2-4x=______.](/uploads/image/z/16996763-11-3.jpg?t=%E8%8B%A5x2-2x%2B1%3D0%EF%BC%8C%E5%88%992x2-4x%3D______%EF%BC%8E)
由x2-2x+1=0,可知x2-2x=-1,
则2x2-4x=2(x2-2x)=2×(-1)=-2.
则2x2-4x=2(x2-2x)=2×(-1)=-2.
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