??$解:(1)3×{10}^{8}×3×{10}^{8}=9×{10}^{16}(米)$??
??$9×{10}^{16}米=9×{10}^{13}千米$??
??$答:1光年約是9×{10}^{13}千米$??
??$(2)100000×9×{10}^{13}=9×{10}^{18}(千米)$??
??$答:約是9×{10}^{18}千米$??
??$(3)3×{10}^{8}m/s=1.08×{10}^{9}km/h$??
??$1.08×{10}^{9}÷1000=1.08×{10}^{6}$??
??$答:光的速度是這架飛機(jī)速度的1.08×{10}^{6}倍$??