Test analysis: scientific notation is expressed as, where n is an integer. When determining the value of n, it depends on how many digits the decimal point moves when the original number becomes a, and the absolute value of n is the same as the number of digits the decimal point moves. When the absolute value of the original number is greater than 1, n is a positive number; When the absolute value of the original number is < 1, n is negative.

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Comments: This problem belongs to the basic application problem, and it can only be completed if students master the scientific notation.