已知\(\sum\limits_{i=m}^{n}{{{a}_{i}}}={{a}_{m}}+{{a}_{m+1}}+\cdots +{{a}_{n}}(\)其中\(m,n\in Z\)，且\(0\leqslant m < n)\)，若\(f(x)=\sum\limits_{i=0}^{n}{{{(-1)}^{i}}}C_{n}^{i}{{(3-x)}^{i}}=\sum\limits_{i=0}^{n}{{{a}_{i}}{{x}^{n-i}}}\)，则 \(\sum\limits_{i=1}^{n}{{{a}_{i}}}\)\(=\)____________