2^b/2^a=6/3=2
2^(b-a)=2
2^c/2^b=12/6=2
2^(c-b)=2
b-a=1
c-b=1
c=b+1
a=b-1
-2a+b+c
=-2b+2+b+b+1
=3
很高兴为您解答,希望对你有所帮助!
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