x/3=y/4=z/5 且3x-2y+z=18 求x+5y-3z

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x/3=y/4=z/5
所以x=0.75y,z=1.25y
又3x-2y+z=18
所以3*0.75y-2y+1.25y=18
y=12
那么x=9,z=15
x+5y-3z=9+5*12-3*15=24

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