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](/uploads/image/z/1256933-29-3.jpg?t=%E6%B1%82%E6%96%87%E6%A1%A3%3A%289991%2A1999.1999%2B1999%2A9991.9991%29%2F2.0002%EF%BC%889991%C3%971999.1999%2B1999%C3%979991.9991%EF%BC%89%C3%B72.0002)
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
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