求文档:(9991*1999.1999+1999*9991.9991)/2.0002（9991×1999.1999+1999×9991.9991）÷2.0002
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求文档:(9991*1999.1999+1999*9991.9991)/2.0002（9991×1999.1999+1999×9991.9991）÷2.0002求文档:(9991*1999.1999+
求文档:(9991*1999.1999+1999*9991.9991)/2.0002（9991×1999.1999+1999×9991.9991）÷2.0002
求文档:(9991*1999.1999+1999*9991.9991)/2.0002
（9991×1999.1999+1999×9991.9991）÷2.0002
求文档:(9991*1999.1999+1999*9991.9991)/2.0002（9991×1999.1999+1999×9991.9991）÷2.0002
（9991×1999.1999+1999×9991.9991）÷2.0002
=(9991×1999×1.0001+1999×9991×1.0001)÷(2×1.0001)
=2×1999×9991×1.0001÷(2×1.0001)
=1999×9991
=（2000-1）×9991
=19982000-9991
=19972009