999.3-998.2+997.3-996.2+…+3.2-2.2+1.3-0.2简算,速求

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999.3-998.2+997.3-996.2+…+3.2-2.2+1.3-0.2简算,速求

999.3-998.2+997.3-996.2+…+3.2-2.2+1.3-0.2简算,速求
999.3-998.2+997.3-996.2+…+3.2-2.2+1.3-0.2简算,速求

999.3-998.2+997.3-996.2+…+3.2-2.2+1.3-0.2简算,速求
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)
=1.1×1000/2
=1.1×500
=550

999.3-998.2=1.1
997.3-996.2=1.1
……
3.3-2.2=1.1
1.3-0.2=1.1 则共有499个1.1相加,499*1.1=548.9