推荐回答（1个）
将一个数字表示成 （a×10的n次幂的形式），其中1≤|a|<10，n表示整数，这种记数方法叫科学计数法。
对于10的指数大于0的情形，数出“除了第一位以外的数位”的个数，即代表0的个数。
如1800000000000，除最高位1外尚有12位，故科学记数法写作1.8×10^12或1.8E12。
10的指数小于0的情形，数出“非有效零的总数（第一个非零数字前的所有零的总数）”
如0.0093，第一位非零数字（有效数字）9前面有3个零，科学记数法写作9.3x10^-3或9.3E-3。即第一位非零数字前的0的个数为n，就为10^-n（n≥0）
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