9.
\((1)\)若\( \dfrac{a}{b}= \dfrac{c}{d}= \dfrac{e}{f}= \dfrac{1}{2} \),则\( \dfrac{3a-2b+e}{3b-2d+f} =\) .
\((2)\)如图,在\(\triangle ABC\)中,若\(DE/\!/BC\),\(AD=2\),\(AE=3\),\(BD=4\),则\(AC=\)_________.
\((3)\)如果一个三角形的三边长为\(3\),\(4\),\(6\),与其相似的三角形的最长边为\(12\),则该三角形的周长为___________.
\((4)\)在\(\triangle ABC\)中,已知\(AB=AC=10\),\(∠A=36^{\circ}\),\(BD\)平分\(∠ABC\)交\(AC\)于点\(D\),则\(AD\)的长为___________.