在3,4,5,7,9,12,15........这串数中,第48个数是几

用分类讨论的方法吧,先考虑末位为0,在考虑末位为2（末位为4,6,8的情况都与2的相同）,就可以了现在比较晚了,我明天再帮你、、能等会儿吗再问：好的，明天中午再答：我正在写、等一下~答案应该是5760

音阶排列是固定的,哪个调的哪个音在几弦几品是不变的．3(Mi)在第二品,4(Fa)就在第三品;7(Xi)是空弦音,1(Do)就在该弦的第一品,这是因为3和4之间,以及7和1之间是半音．其它各音之间要隔

thistimeonedayintheeveningattheeveofChristmasattwelveatwinterin2006manyyearspastinmentionofbefitfora

1OnMay12in20123intheweekend4onMonday5at4:306playtheguitar7up8gotobed9home10arrivedattheschool

9无论加还是减8都为奇数加或减7为偶数偶数加减偶数6为偶数偶数加减奇数5为奇数奇数加减偶数4为奇数奇数加减奇数3为偶数偶数加减偶数2为偶数偶数加减奇数1为奇数因为20不是奇数所以无解

inJanuaryonJanuary2rdonApril12thonMondayat8o'clockthismorninginDecemberinOctobertwelvemonthsyearmyfa

由题意可知：排列为1，3，5，7，…2n-1，2n-1=2011，则n=1006，说明第2011是第1006个奇数，又因为1006÷4=251…2，所以数2011排在第252行，行数为偶数，所以从第四

再答：再问：6分之7除以9分之5在乘以14分之5再问：5分之2减去5分之2在除以2在乘以3分之5再答：

1、At10:30inthemorning2、At8:45thisevening3、Oneandahalfhours4、Nextmarch5、Thedaybeforeyesterday6、OnSept

1是青2是日3是十4是口5是木6是勿7是女1+2=青+日=晴.2+3=日+十=早3+4=十+口=古4+5=口+木=呆4+6=口+勿=吻4+7=口+女=如

1Sittinginfrontofme2inthebusfrontthreeinbetweenherandme4inoppositethesupermarket5ontheplatform620,00

1+2+3+4+5-6+7+8+9-10-11-121+2+3-4-5-6-7-8-9+10+11+12

753428961614957382892163457138245796975316248426789135289574613367891524541632879

1.postoffice2.onCenterStreet3.payphone4.acrossfromthebank5.between...and...6.near或nextto7.intheneigh

1、在3:45atthreeforty-fiveataquartertofour2、在4:15atfourfifteenataquarterpastfour3、在5点atfive(o'clock)4、

2009是第1005个数1-44组共990个数所以2009在第45组

InMayInOctober2008Inthespring\summer\autumn\winterInAugust12InFebruary25,2008InMother'sDayInTeacher'

规律：1在第一圈,2~4在第二圈,5~9在第三圈,10~16在第四圈.(n-1)^2+1~n^2在第n圈如果n为奇数,则顺序为(n-1)^2+1在第1行第n列,然后(n-1)^2+2在第2行第n列..

ushmyteetheathisbreakfastataquarterpastfouratfivefifteenathalfpastoneatseven祝你学习进步

1.inthefrontof2.infrontof3.amoung……4.nearto5.aroundtheshop8.beween……9.inthemorning10.inarainyafterno