Explanation:
1st question
a)AB=-a+b=b-a
b)OC=a+b-a+3/2(b-a)=b+3/2b-3/2a=5/2b-3/2a=(5b-3a)/2
2nd question
a)CA=2a
b)AB=-a+b=b-a
c)BC=-b-a
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