若x:3=y:4=z:5,且3x-2y+2z=18,则2x+5y-3z=多少
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若x:3=y:4=z:5,且3x-2y+2z=18,则2x+5y-3z=多少
![若x:3=y:4=z:5,且3x-2y+2z=18,则2x+5y-3z=多少](/uploads/image/z/3573244-28-4.jpg?t=%E8%8B%A5x%EF%BC%9A3%3Dy%EF%BC%9A4%3Dz%EF%BC%9A5%2C%E4%B8%943x-2y%2B2z%3D18%2C%E5%88%992x%2B5y-3z%3D%E5%A4%9A%E5%B0%91)
∵x:3=y:4=z:5
∴可设x=3k,y=4k,z=5k
∴3x-2y+2z=18
9k-8k+10k=18
k=18/11
∴2x+5y-3z
=6k+20k-15k
=11k=18
∴可设x=3k,y=4k,z=5k
∴3x-2y+2z=18
9k-8k+10k=18
k=18/11
∴2x+5y-3z
=6k+20k-15k
=11k=18
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