0.0045m=?um＝?nm,0.25m=?um=?nm 请用科学计数法,
问题描述：
0.0045m=?um＝?nm,0.25m=?um=?nm 请用科学计数法,
答
0.0045m=4.5×10^3um=4.5×10^6nm,0.25m=2.5*10^5um=2.5*10^8nm
0.0045m=?um＝?nm,0.25m=?um=?nm 请用科学计数法,
0.0045m=4.5×10^3um=4.5×10^6nm,0.25m=2.5*10^5um=2.5*10^8nm