(9991x1999.1999+9991.9991x1999)除2.0002

问题描述:

(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