来自陈云的问题
从1000到2000的自然数中所有偶数之和与所有奇数之和的差是多少
从1000到2000的自然数中所有偶数之和与所有奇数之和的差是多少
1回答
2020-03-22 23:55
我要回答
请先登录
蔡斌
你要求的是
1000-1001+1002-1003+……+1998-1999+2000
=1000+(1002-1001)+(1004-1003)+……+(2000-1999)
=1000+1*500
=1500
2020-03-22 23:59:30
最新问答
推荐文章
猜你喜欢
附近的人在看
推荐阅读
拓展阅读
- 小明向希望工程的小朋友捐款125元,小丽比小明多捐2元,他们两人捐款总数恰好是小健捐款数的1.5倍,小健捐款多少元?
- 【WhenIwas13yearsoldIusedtobabysit(当临时保姆）fortheladynextdoor.Everytwo36____shewouldpayme80dollars.Ialwayslookedforwardtogetting37____soIcouldgotothesupermarketwithmyfriendsonSaturday】
- 【关于天文望远镜的说法错误的是（）A.让更多的光射入到物镜中B.力求把物镜的口径加大C.采用焦距很大的凸透镜作物镜D.增大观察的视角】
- 【pandababys与babypandas有区别吗?】
- 英语翻译elvagirlbringitoncuzwecanbabyrockittil'daearlymorn.we'regonnakeepitgoin'babyonandon.webeholdn'tdown'ttil'dabreakofdawn.ohcomeandhitmebabyonemoretimecuzthescentofyoumakesmelosemymindtakin'cont
- I'lllookafteryourbabycarefully.(改同义句)I'll____________yourbaby.
- 【小芳今年5岁，3年后，小芳幼儿园的李老师比小芳大20岁，李老师今年多少岁？】
- Bywhomisthebabylookedafter?特殊疑问句,不是以特殊疑问词开头的吗?为什么这句话会以一个介词开头（我知道这句话是被动语态）?这是什么语法?
- 买了一个博冠70/900的天文望远镜,可是不知道怎么观测,看不懂说明书哦……白天用主镜观测远处景物是模模糊糊的,不知怎样才会看清楚?晚上也不知道怎样观测星星,把望远镜对准天空却是一
- Shehadto__________severaltimesanightwhenherbabywasill.1.callout2.getahead3.wakeup4.cometo
- 折射式天文望远镜的增倍镜怎样用,该装在（主镜-天顶镜-目镜的）哪里?
- 小丽的画片数是贝贝的1.5倍,小丽给贝贝5张,小丽和贝贝后来的画片就一样多.小丽原有多少张画片?
- MynameisJaneEyreandmyparentsdiedwhenIwasababy.FortenyearsIliveda___1___lifewithmyauntandcousinswhotreatedmeunfairly.Mycousinsteasedmeandmyauntnevershowedmeany___2___.Theonlypersonwhocaredaboutm
- 【英语翻译YouareMyEverythingBY:LexingtonBridgeBabyIcan'tletyougoIthinkaboutyouallthetimeThinkaboutyouallthenightsYouandmewecreepin'nexttotheseaYoubroughtthefreshchampagneAndI'dlightthefireSometimesIreally】
- 小丽的画片数是贝贝的1.5倍,小丽给贝贝5张,贝贝和小丽的画片就一样多了.小丽有多少张画片?用算式做
- thebaby-siatertriedto()thebabytosleepandhersoftvoicesoontookeffect?agetbmanagecpersuadedsing请问选择那个?说明原因
- 【英语翻译TheApeFamilySung:Welovethebabybonobo,They’repartoftheapefam-i-lyTheyrideonmommiesbackTheysometimestakeanapSayhellototheapefam-i-ly!(Sayhellototheapefamily!)BabyapesarebusyatthezooTheyclimbandtheyp】
- I______greatpityonthewomanwhosebabydied.A.gaveB.putC.basedD.took
- 小丽的爸爸前年存了年利率为2.25%的二年期定期储蓄，今年到期后，扣除利息的20%作为利息税，所得利息正好为小丽买了一只价值36元的计算器，问小丽爸爸前年存了多少元钱？
- 【Icantakegoodcareofthebaby如何该成被动语态?Icantakegoodcareofthebaby这句话如何改成被动语态呢?教教我】
- Whentheman’swifedied,theiryoungestbabywas2yearsold.Theyhadsixotherchildren—threeboysandthreegirls,agedfrom4to16.Theman’sparentsandhiswife’sparentscametovisit.“We’vebeentalkingabouthowtomak
- 英语翻译IfonlyyoubelievelikeIbelievebabywe'dgetbyifonlyyoubelieveinmiraclesbabysowouldIIfonlyyoubelievelikeIbelievebabywe'dgetbyIfonlyyoubelieveinmiraclesbabysowouldIImighthavetomoveheavenandearthtoprov
- WangYaniwasbornin1975.Evenasababyshelovedtodraw.Herfatherwasan1.Yaniwantedtobelikehim.Soshetriedtostandlikeherfatherasshepainted,whichmadehimlaugh.Oneday,Yanipaintedlinesonherfaher’spainting.
- LikeanygoodmotherwhenKarenfoundoutthatanotherbabywasonthewayshedidwhatshecouldtohelpher3-year-oldsonMichaelprepareforanewbaby.DayafterdaynightafternightMichaelsangtohismommy’stummy(肚子).FinallyMi
- 2Assoonasthebabysawhermother,she_____.AwasgoingtocryBcryedCbegantocryDwascrying是不是选b啊
- Eitherofthechildren()quitecapableoflookingafterthebaby.A.areB.beC.isD.havebee为什么选d不选c
- 【Youaremyonebabyforever!这句有语法错误吗?】
- 【写出下列词的过去式和过去分词babysitforbidmustsmellsinkdreamshuthidegetthrowshootriseoversleepfleelendshakedriveshoothitheatfixdropliftescapepreferinterestexpectfrystayshocktrekpackprovidesetcoachsprinkle】
- find的第三人称单数?/还有baby（复数）watch（第三人称单数）know（同音词）woman（复数）fifth（基数词）funny（名词）
- 【关于babyfood的英语文章请帮我写一篇关于外国人给孩子吃什么的英文文章,最好能有中文翻译!】