3.
如图,在平行六面体\(ABCD-A_{1}B_{1}C_{1}D_{1}\)中,设\(\overrightarrow{A{{A}_{1}}}=\overrightarrow{a} \),\(\overrightarrow{AB}=\overrightarrow{b} \),\(\overrightarrow{AD}=\overrightarrow{c} \),\(M\),\(N\),\(P\)分别是\(AA_{1}\),\(BC\),\(C_{1}D_{1}\)的中点,试用\(\overrightarrow{a} \),\(\overrightarrow{b} \),\(\overrightarrow{c} \)表示以下各向量:
![](https://www.ebk.net.cn/tikuimages/2/2018/600/shoutiniao84/930d2ef8a35665d99a495dbaeb74e327.png)
\((1)\overrightarrow{AP}\);
\((2)\overrightarrow{{{A}_{1}}N}\);
\((3)\overrightarrow{MP}+\overrightarrow{N{{C}_{1}}}\).