(9991乘1999.1999+9991.9991乘1999)除以2.0002要简便

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(9991乘1999.1999+9991.9991乘1999)除以2.0002要简便(9991乘1999.1999+9991.9991乘1999)除以2.0002要简便(9991乘1999.1999+

(9991乘1999.1999+9991.9991乘1999)除以2.0002要简便
(9991乘1999.1999+9991.9991乘1999)除以2.0002
要简便

(9991乘1999.1999+9991.9991乘1999)除以2.0002要简便
(9991乘1999.1999+9991.9991乘1999)除以2.0002
=(9991×1999×1.0001+9991×1.0001×1999)/2.0002
=9991×1999×2.0002/2.0002
=9991×1999
=19972009