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!
答
200000m=2×10^2 km,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