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For smartphone, the battery performance is one of the important technical specifications. A company has designed a version of smartphone, and has done some tests

For smartphone, the battery performance is one of the important technical specifications. A company has designed a version of smartphone, and has done some tests on the battery life. Let X denotes the amount of time that the fully charged battery can last for Internet surfing. The unit of X is hour and it is omitted in the following discussion.

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