5.
\((1)\)计算:\((-ab)^{2}÷a^{2}b=\)___________.
\((2)\)已知\(2^{x}=3\),则\(2^{x+3}\)的值为_________.
\((3)\)已知\(∠α=40^{\circ}\),则\(∠α\)的余角为________.
\((4)\)一辆汽车由甲地开往相距\(130km\)的乙地,若它的平均速度为\(65km/h\),则汽车距乙地的路程\(s(km)\)与行驶时间\(t(h)\)之间的关系式是___________.
\((5)\)将一副三角尺按如图所示的方式叠放\((\)两条直角边重合\()\),则\(∠α\)的度数是______.
\((6)\)如图,已知在\(\triangle ABC\)中,\(∠A=155^{\circ}\),第一步:在\(\triangle ABC\)的上方确定点\(A_{1}\),使\(∠A_{1}BA=∠ABC\),\(∠A_{1}CA=∠ACB\);第二步:在\(\triangle A_{1}BC\)的上方确定点\(A_{2}\),使\(∠A_{2}BA_{1}=∠A_{1}BA\),\(∠A_{2}CA_{1}=∠A_{1}CA\);\(…\),则\(∠A_{1}=\)____;照此继续,最多能进行_______步.