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a/b=c/d=e/f=2. 假定a=2則b=1 c=4則d=2 e=6則f=3 2a+3d-f=2*2+3*2-6=4不為0 所以2a/3c-e/2b+3d-f=2*2/3*4-6/2*1+3*2-3=1/3-3+6-3=1/3 答案為1/3
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