7.
\((1)\)若\(2⋅4^{m}⋅8^{m}=2^{16}\),则\(m= \)______ .
\((2)\)已知\(x+y=10\),\(xy=16\),则\(x^{2}y+xy^{2}\)的值为______ .
\((3)\)因式分解:\(a^{3}-a= \)______ .
\((4)\)如图,在\(\triangle ABC\)中,\(∠A=40^{\circ}\),\(D\)点是\(∠ABC\)和\(∠ACB\)角平分线的交点,则\(∠BDC= \)______ .
\((5)\)已知\(a^{2}-3a+1=0\),则代数式\((a+1)(a-4)\)的值为______ .
\((6)\)如图,在\(\triangle ABC\)中,\(∠A=96^{\circ}\),延长\(BC\)到\(D\),\(∠ABC\)与\(∠ACD\)的平分线相交于点\({{A}_{1}}\),则\(∠{{A}_{1}}= \)______ ,若\(∠{{A}_{1}}BC\)与\(∠{{A}_{1}}CD\)的平分线相交于点\({{A}_{2}}\),则\(∠{{A}_{2}}= \)______ ,\(…\),以此类推,则\(∠{{A}_{n-1}}BC\)与\(∠{{A}_{n-1}}CD\)的平分线相交于点\({{A}_{n}}\),则\(∠{{A}_{n}}\)的度数为______ .