在1,3,5,7,9,11,13,15中选三个数相加的30

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

1/33/65/97/129/15……所以199/300

inJanuaryonJanuary2rdonApril12thonMondayat8o'clockthismorninginDecemberinOctobertwelvemonthsyearmyfa

1/9=5/45.1/3=5/15.所以括号中填16到44之和为870.

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

在第45个括号里可能不对

很简单啊.1/3,3/6,5/9.关键是把1/2化成3/6就行了.然后,学过归纳法的很快就能看出来的.通项式就是（2n-1）/（3n）,其中n为自然数.用50代进去就行了.99/150,即33/50.

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