若x-2y=3,则2x-4y-7=______.
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若x-2y=3,则2x-4y-7=______.
![若x-2y=3,则2x-4y-7=______.](/uploads/image/z/19976756-68-6.jpg?t=%E8%8B%A5x-2y%3D3%EF%BC%8C%E5%88%992x-4y-7%3D______%EF%BC%8E)
∵x-2y=3,
∴2x-4y-7
=2(x-2y)-7
=2×3-7
=6-7
=-1.
故答案为:-1.
∴2x-4y-7
=2(x-2y)-7
=2×3-7
=6-7
=-1.
故答案为:-1.
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