问题标题：
【200000m=km,500000cm=m,0.0035mm=m,0.005m=km,0.007μm=m,0.00056m=nm用科学计数法计算!】
问题描述：
200000m=km,500000cm=m,0.0035mm=m,0.005m=km,0.007μm=m,0.00056m=nm用科学计数法计算!
冯彦君回答：
200000m=2×10^2km,500000cm=5×10^3m,0.0035mm=3.5×10^(-6)m,
0.005m=5×10^(-6)km,0.007μm=7×10^(-9)m,0.00056m=5.6×10^5nm
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