问题标题:
999.3-998.2+997.3-996.2+…+3.2-2.2+1.3-0.2简算,速求
问题描述:
999.3-998.2+997.3-996.2+…+3.2-2.2+1.3-0.2简算,速求
陈玲回答:
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
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