5.
已知\(\{a_{n}\}\)是各项均为正数的等比数列,且\(a_{1}+a_{2} =6\),\(a_{1}a_{2}= a_{3}\).
\((1)\)求数列\(\{a_{n}\}\)的通项公式;
\((2)\{b_{n}\}\)为各项非零的等差数列,其前\(n\)项和为\(S_{n}.\)已知\(S_{2n+1}=b_{n}b_{n+1}\),求数列\(\left\{ \left. \dfrac{b_{n}}{a_{n}} \right. \right\}\)的前\(n\)项和\(T_{n}\).