阅读材料中国古代在数的发展方面的贡献.ppt

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（）,A.,是正数，也是有理数,B.,是整数，但不是自然数,C.,不是正数，但是自然数,D.,不是整数，但是有理数,C,补充练习：,2.,汽车向南行驶,3km,，记作,+3km,；那么向,方向行驶,5km,，可记作,5km,。,北,向东运动,2,米,0,米,补充练习：,3.,东、西为两个相反方向，如果,4,米表示一个物体向西运动,4,米，那么,2,米表示,_,，物体原地不动记作,_,。,4.,按要求填空,（,1,）某厂去年亏损,2.5,万元，记作,2.5,万元；则今年盈利,4.1,万元，记作,.,+4.1,万元,4.,按要求填空,（,2,）若向东走,100m,，记作,+100m,；那么,70m,表示,.,（,3,）若,+3,表示体重增加了,3kg,，那么,2,表示体重,.,向西走,70m,减小了,2kg,5.,下表是某日上海发行的部分债券行情表，试说明各债券当天涨跌情况。,名称,99,国债,（,1,）,99,国债,（,2,）,99,国债,（,3,）,01,通化债券,01,三峡债券,涨跌,/,元,0.01,0.05,1.24,0.15,2.01,99,国债,(1)_;99,国债,(2)_;,99,国债,(3)_;01,通化债券,_;,01,三峡债券,_.,涨,0.01,元,跌,0.05,元,跌,1.24,元,涨,0.15,元,跌,2.01,元,6,、某食品包装袋上标有,”,净含量,385,克,5,克,”,这包食品的合格净含量范围是,_,克。,380,390,探索与思考：,1,、文具店、小明家和书店依次座落在一条东西走向的大街上，文具店在小明家西边,200m,处，书店位于小明家东边,100m,处，小明从家里出发向东走了,40m,，接着又向西走了,60m,，此时小明在哪里？,书店,小明家,文具店,西,东,100m,200m,探索与思考：,2,、研究下面一组数的规律后填空：,1,，,3,，,7,9,，,（,1,）根据你的研究，处的数应该,是,。,（,2,）想一想，第,8,个数应该是,，,第,2005,个数是,。,5,15,4009,再见,