帮忙解一道算数题好吗?(9991×1999.1999+9991.9991×1999)÷2.0002

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帮忙解一道算数题好吗?(9991×1999.1999+9991.9991×1999)÷2.0002
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帮忙解一道算数题好吗?(9991×1999.1999+9991.9991×1999)÷2.0002
帮忙解一道算数题好吗?
(9991×1999.1999+9991.9991×1999)÷2.0002

帮忙解一道算数题好吗?(9991×1999.1999+9991.9991×1999)÷2.0002
(9991×1999.1999+9991.9991×1999)÷2.0002
=(9991×1999×1.0001+9991×1.0001×1999)÷2.0002
=9991×1999×2.0002÷2.0002
=9991×1999
=19972009

9991*1999+9991*0.1999+9991*1999+0.9991*19999=2×9991×1999+2×1999×0.9991=9991*1999*(2+0.0002)=9991*1999*2.0002
所以原式等于9991×1999即(10000—9)×(2000-1)=20000000-10000-18000+9=19972009.