数学竞赛题集：代数、几何与应用问题.pdfVIP

1、心里想到3个数，它们的和是19，又知道第二个数比第一个大1，第三

个又比第二个大2。请猜出心中想的这三个数中最大的数是？

2、请问圆形代表的数?

3、A、B和C三个同学在操场跑步，A同学4分钟跑一圈，B同学2分钟跑一

圈，C同学3分钟跑一圈，如果他们三人同时从同一起点起跑，问分钟后他

们三人再次相遇？

4、某数减去2，除以5，加上3，最后结果等于7。请问这个数是几?

5、出门买水果。她先用这些钱的二分之一买了鸭梨，又买了23元钱

的荔枝，最后还剩下13元钱。你知道原来有元钱吗？

1.ZhangXinthinksof3numbersinhermind,andtheirsumis19.Shealsoknowsthatthe

secondnumberis1greaterthanthefirst,andthethirdnumberis2greaterthanthesecond.

PleaseguessthelargestnumberamongthethreenumbersLiuMinisthinkingaboutis?

2.Whatisthenumberrepresentedbyt

hecircle?

3.ThreestudentsA,BandCarerunningontheyground.StudentA

runsonelapin4minutes,studentBrunsonelapin2minutes,and

studentCrunsonelapin3minutes.Ifthethreeofthemstartfromthe

samestartingpointatthesametime,willtheymeetagainin

minutes?

4.Subtract2fromacertainnumber,divideitby5,andadd3.Thefinalresultisequalto7.Whatis

thisnumber?

5.ZhangMingwentouttobuyfruit.Shefirstusedone-halfofthemoneyto

buypears,andthenboughtlycheesfor23yuan,andfinallyshehad13

yuanleft.DidyouknowthatZhangMingoriginallyhad