0.0045m=?um=?nm,0.25m=?um=?nm 请用科学计数法,

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0.0045m=?um=?nm,0.25m=?um=?nm请用科学计数法,0.0045m=?um=?nm,0.25m=?um=?nm请用科学计数法,0.0045m=?um=?nm,0.25m=?um=

0.0045m=?um=?nm,0.25m=?um=?nm 请用科学计数法,
0.0045m=?um=?nm,0.25m=?um=?nm 请用科学计数法,

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

0.0045m=0.0045*10^6um=0.0045*10^9nm
两个一样的好不,基础没学好啊

0.0045m=0.0045×10⁶um=4.5×10³um
0.0045m=0.0045×10⁹nm=4.5×10⁶nm
0.25m=0.25×10⁶um=2.5×10⁵um
0.25m=0.25×10⁹nm=2.5×10⁸um