(9991x1999.1999+9991.9991x1999)除2.0002
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![(9991x1999.1999+9991.9991x1999)除2.0002](/uploads/image/z/1256935-31-5.jpg?t=%289991x1999.1999%2B9991.9991x1999%EF%BC%89%E9%99%A42.0002)
(9991x1999.1999+9991.9991x1999)除2.0002
(9991x1999.1999+9991.9991x1999)除2.0002
(9991x1999.1999+9991.9991x1999)除2.0002
(9991x1999.1999+9991.9991x1999)除2.0002
=(9991x1999x1.0001+9991x1999x1.0001)除2.0002
=2x(9991x1999x1.0001)÷2.0002
=9991x1999