某种细菌的直径约为0.00 000 002米,用科学记数法表示该细菌的直径约

某种细菌的直径约为0.00 000 002米,用科学记数法表示该细菌的直径约为____.

答案

【解析】

试题解析:0.00 000 002=2×10-8.

点睛:绝对值小于1的正数也可以利用科学记数法表示,一般形式为a×10-n,与较大数的科学记数法不同的是其所使用的是负指数幂,指数由原数左边起第一个不为零的数字前面的0的个数所决定.

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