Ответ:\(0{,}0000087=8{,}7\cdot10^{-6}\).\(0{,}00000005086=5{,}086\cdot10^{-8}\).\(\frac1{125}=0{,}008=8\cdot10^{-3}\).\(\frac1{625}=0{,}0016=1{,}6\cdot10^{-3}\).