x/a=y/b=z/c=2求(2x-3y+z)/(2a-3b+c)
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x/a=y/b=z/c=2求(2x-3y+z)/(2a-3b+c)
x/a=y/b=z/c=2求(2x-3y+z)/(2a-3b+c)
x/a=y/b=z/c=2求(2x-3y+z)/(2a-3b+c)
设x/a=y/b=z/c=2m,所以X=2MA,Y=2MB,Z=2MC,代入,出结果=2