规定：0.1=1/10=10^-1,0.01=1/100=10^-2,0.001=1/1000=10^-3
问题描述：
规定：0.1=1/10=10^-1,0.01=1/100=10^-2,0.001=1/1000=10^-3
用十的指数形式表示0.00001,0.000001
将0.0038695表示成a×10^n的形式（1≤a＜10, n为负数
答
3.8695*10^-3