3a-c=a+b+c得到2a=b+2c①
3a-c=4a+2b-c得到a=-2b②
由上两式得出,2c=-5b即c=-5b/2
所以3a=-6b
2b=2b
c=-5b/2
所以3a:2b:c= 12:(-4):5
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