已知x/3=y/4=z/5,且2x+y-z=21,则3x+y+z=
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已知x/3=y/4=z/5,且2x+y-z=21,则3x+y+z=已知x/3=y/4=z/5,且2x+y-z=21,则3x+y+z=已知x/3=y/4=z/5,且2x+y-z=21,则3x+y+z=设
已知x/3=y/4=z/5,且2x+y-z=21,则3x+y+z=
已知x/3=y/4=z/5,且2x+y-z=21,则
3x+y+z=
已知x/3=y/4=z/5,且2x+y-z=21,则3x+y+z=
设x/3=y/4=z/5=k
∴x=3k,y=4k,z=5k
∴2x+y-z=6k+4k-5k=5k=21
∴k=21/5
∴3x+y+z=9k+4k+5k=18k=378/5
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