简算999.3-998.2+997.3-996.2+...3.3-2.2+1.3-0.2

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简算999.3-998.2+997.3-996.2+...3.3-2.2+1.3-0.2简算999.3-998.2+997.3-996.2+...3.3-2.2+1.3-0.2简算999.3-998.

简算999.3-998.2+997.3-996.2+...3.3-2.2+1.3-0.2
简算999.3-998.2+997.3-996.2+...3.3-2.2+1.3-0.2

简算999.3-998.2+997.3-996.2+...3.3-2.2+1.3-0.2
=(999.3-998.2)+(997.3-996.2)+……+(3.3-2.2)+(1.3-0.2)
=1.1+1.1+……+1.1+1.1
=1.1*50
=55

550