外国语学校小升初英语奥数训练题第一部分1、三个素数的倒数之和是,则这三个素数中最大的是多少?1.Thesumofthereciprocalsofthreeprimenumbersis,sowhatisthegreatestoneamongthethreeprimenumbers?2、有一个分数,它的分子加2,可以约简为;它的分母减2,可以约简为。这个分数是多少?2.Thereisafraction.Ifitsnumeratoradds2,itcanbereducedtobe;ifitsdenominatorsubtracts2,itcanbereducedtobe.Sowhatisthisfraction?3、一个数分别除以,,,所得的商都是自然数。这个数最小是多少?3.Anumberisdividedby,andrespectivelyandthequotientsareallnaturalnumbers.Sowhatistheminimumvalueofthisnumber?4、一片竹林,去年不开花的竹子比开花的2倍还多55棵,今年又多了100棵开花,这时开花的竹子恰好是不开花的4倍,这片竹林有多少棵竹子?4.Thereisabambooforest.Lastyear,thenon-bloomingbamboosweretwotimesand55morethanthebloomingbamboos.Withanother100bamboosbloomingthisyear,thebloomingbamboosarefourtimesasmanyasthenon-bloomingbamboos.So,howmanybamboosarethereinthisforest?(红色的地方我有点不确定,葛老师您看看应该怎么翻)-1-5、从中去掉两个分数,余下的分数之和为1。这两个分数是哪两个分数?5.Takeouttwofractionsfromtomakethesumofremainingfractionstobe1.Sowhatarethesetwofractions?6、一个整数与它的倒数的和等于20.05,这个整数是多少?它的倒数是多少?6.Thesumofanintegeranditsreciprocalis20.05,sowhatisthisintegerandwhatisitsreciprocal?7、四个非零自然数的和为38,这四个自然数的乘积的是小值是多少?最大值是多少?7.Thesumoffournonzeronaturalnumbersis38,sowhatcantheminimumproductofthesefournaturalnumbersbe?Andwhatcanthemaximumproductbe?8、已知a是质数,b是偶数,且a2+b=2008,则a+b+1结果是多少?8.Itisknownthataisaprimenumberandbisanevennumberandthata2+b=2008,sowhatistheresultofa+b+1?9、一个质数p,使得p+2,p+4同时都是质数。则的结果是多少?9.Thereisaprimenumberp,whichcanmakep+2andp+4tobeprimenumbersaswell.Sowhatistheresultof?10、彼此不等且大于0的偶数a,b,c,d满足a+b+c+d=20,这样的偶数组-2-(a,b,c,d)共有多少组?10.Therearefourdifferentevennumbersa,b,candd,whichareallgreaterthan0.Iftheyshouldsatisfytheequationofa+b+c+d=20,howmanygroupsofsuchevennumbers(a,b,c,d)arethere?11、在一个两位数的中间加上一个0,得到的新数比原来大8倍,原来的两位数是多少?11.Adda“0”tothemiddleplaceofadouble-digitnumber,sothatthenewthree-digitnumberis8timesmorethantheoriginalnumber.Sowhatistheoriginaldouble-digitnumber?12、如图,从A到B有多少条不同的路线?(只能向上或向左走)BA12.Asshowninthepicture,howmanydifferentwaysaretheretogofromAtoB?(Onecanonlywalkuportowardsleft)13、小马虎在考试中做一道计算题时,将一个数乘9错算成除以9,接着又将加上30错算成减去30,结果得18,如果按正确的运算顺序,所得的结果是多少?13.Whendoingacalculationinanexam,acarelessstudentmadesomemistakes.Ratherthanmultiplyinganumberby9andthenadding30,hedividedthenumberby9andthensubtracted30,sothattheresultwas18.Ifhedidthecalculationcorrectly,whatwouldtheresultbe?-3-14、袋里有若干个球,其中红球占,后来又往袋里放了6个红球,这时红球占总数的。现在袋里有多少个球?14.Therearesomeballsinabagandtheredballsaccountforofthetotalamount....