试题二1.Didyouknow?Inthedecimalnumbersystem(base10)tendifferentdigits,0to9,areusedtowriteallthenumbers.Inthebinarynumbersystem(base2)twodifferentdigitsareused,i.e.0and1.Whichoneofthefollowingnumbersisnotavalidnumberintheoctalnumbersystem(base8)?[来源:Z§xx§k.Com]A)128B)127C)126D)125E)1242.Thenumberofdiagonalsthatcanbedrawninaregularpolygonwithtwentysides(icosagon)is_____.3.Ifaandbareintegers,10Ä3=1,152Ä7=3,andthen379Ä6isequalto_____.4.Twonumbersareintheratio2:3.When4isaddedtoeachnumbertheratiochangesto5:7.Thesumofthetwooriginalnumbersis____.5.ThegreatestnumberofMondayswhichcanoccurin45consecutivedaysis____6.Saulplaysavideogameinwhichhescores4forahitandlost6foramiss.After20roundshisscoreis30.Thenumberoftimeshehasmissedis____.7.ThreegirlsA,BandCrunina100mrace.WhenAfinishes,Bis10mbehindAandwhenBfinishesCis20mbehindB.HowfarinmetreswasCfromAwhenAfinished?(Let’sassumealltheathletesrunataconstantspeed)小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.com8.Theareasofthefacesofarectangularboxare84cm2,70cm2and30cm2.Thevolumeoftheboxincm3is____.9.Youhave3weights:1kg,3kgand9kgaswellasanequalarmbalance,asshown.Howmanydifferentweightobjectscanyouweighwiththesethree?[Remembertheweightsmaybeplacedoneitherside][来][来源:学科网]参考答案：1.A考察我们学过的简单的进制问题，显然8进制中没有8出现2.170找规律，公式为n×(n-3)÷23.1定义新运算，就是求379÷6的余数。4.40，16和245.76.57.28米，根据距离比求出速度比，三者的速度比为1：9/10：18/25[来源:学&科&网]8.420分解质因数[来Com]9.13种小学、初中、高中各种试卷真题知识归纳文案合同PPT等免费下载www.doc985.com