用科学计数法表示下列数：0.000000001,0.0012,0.000000345,0.0000000108

题目

用科学计数法表示下列数：0.000000001,0.0012,0.000000345,0.0000000108

答案

0.000000001,
=1×10^（-9）；
0.0012,
=1.2×10^（-3）；
0.000000345,
=3.45×10^（-7）；
0.0000000108
=1.08×10^（-8）；
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