8.
已知向量\( \overrightarrow{a}=(2,1)\),\( \overrightarrow{b}=(1,1)\),\( \overrightarrow{c}=(5,2)\),\( \overrightarrow{m}=λ \overrightarrow{b}+ \overrightarrow{c}(λ\)为常数\()\).
\((1)\)求\( \overrightarrow{a}+ \overrightarrow{b}\);
\((2)\)若\( \overrightarrow{a}\)与\( \overrightarrow{m}\)平行,求实数\(λ\)的值.