x/2=y/3 所以 y=3/2x
x/2=z/4 所以 z=2x
x-4y+3z/x+4y-3z=x-4*3/2x+3*2x/x+4*3/2x-3*2x=x-6-6x=-6-5x
x/2=y/3=z/4.求x-4y+3z/x+4y-3z
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