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+…+3.3-2.2+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

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+1.3-0.2 999.3-998.2+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,等于多少? 999.3-998.2+997.3-996.2+...+3.3-2.2+1.3-0.2 玉树作文需求求求求求求求求求求求求求速来十万火急! 3.2.-1.3求24点求楹联,速求速求。速求 ,速求求英语学霸帮解,速求,