初三数学竞赛及答案

一次，他在核实数据时，认为部分数据需要重新测量，但项目部的车都被派出去了。belimitedtonomorethan2daysofwork,materialdepositedinspecialinsulatedcontainers,materialhandlingtogentlyandmakeuseofthermalinsulationmaterialinwindproof,waterproof,moisture-proofmeasure.6.2thermaldesignoptimizationforhigh-temperaturespecialthermalinsulationforpipingsupportandhangerdesign,reducedheatdissipationofthehangers,ensurethatthewalldoesnotoverheat.Small-diameterpiping,thermalinstrumentlayoutandpositioningofsupportandhangerdesigntakefullyintoaccounttheexpansionspaceandinsulationthickness.Large-diameterpipesafterheatpreservationplasteringconstructionofvalves,turbine,checkingsmoothsurface,hightemperaturepowderpaintfullydryafter.Protectivecoveringsforelectricequipmentinsulationboardsdesignedwithpressureplate,whenorderingaccordingtotheinstallationdiagram,modelspecificationspublishingorder,ensurewheninstallingcornersneat,uniformappearance,reducetheamountofon-sitemachining.Beforevalves,flangeinsulationshellconstruction,besuretomakeaunifiedmodel,allvalves,flanges,insulationcoverunified,tidyandbeautiful.Whenfourpartssuchaspipes,boilerinsulation,mustdofirstarticleinspection,proofofdesignandconstructionmethods,technologycanmeetthetechnologicalrequirements,beforeextensiveconstruction.Boilersteelbeams,dooropeningboxesdesignedwithinsulationgaskets,flangecannotbeoblique,evenfastened.Backintotheslopeofthetubingduringinstallationpayattentiontothepiping,oilstationisalowpoint.Refuelingmustbecontrolledwhencastingmaterialparts,selectlowthermalconductivitymaterialsasfaraspossible,ensurethatthesepartsdonotoverheat.6.3qualitydefectsofinsulationtechnologymanagementoptimizationofconstructionprocessanddevelopareasonableduration,regionaltransferofstrictly2010年广州市白云区初三数学竞赛试卷（完成时间：120分钟，满分100分）学校姓名得分一、选择题（下列各题均有四个选项，其中只有一个．．是符合题意的．共8个小题，每小题3分，共24分）1．在平面直角坐标系中，点A（x，2y）在第四象限，那么点B（2y，x）在（）A．第一象限B．第二象限C．第三象限D．第四象限2.计算(-2)2005+(-2)2006所得结果是()A.2B.－2C.1D.220053．在一个仓库里堆积着正方体的货箱若干，要搬运这些箱子很困难，可是仓库管理员要落实一下箱子的数量，于是就想出一个办法：将这堆货物的三种视图画了出来，如图，你能根据三视图，帮他清点一下箱子的数量吗？这些箱子的个数是()A．9B．8C．7D．64．已知2110xxxx，则，，的大小关系是（）（A）21xxx（B）21xxx（C）21xxx（D）21xxx5．13个小朋友围成一圈做游戏，规则是从某一个小朋友开始按顺时针方向数数，数到第13，该小朋友离开；这样继续下去.，直到最后剩下一个小朋友.小明是1号，要使最后剩下的是小明自己，他应该建议从几号小朋友开始数起？（A）7号（B）8号（C）13号（D）2号（第4题）6．已知22204(2)abxabybaxy、是实数，，，则、的大小关系是（）（A）xy（B）xy（C）xy（D）xy7．将长为15cm的木棒截成长度为整数的三段，使它们构成一个三角形的三边，则不同的截法有()A．5种B．6种C．7种D．8种8.古人用天干和地支记次序，其中天干有10个：甲乙丙丁戊己庚辛壬癸。地支也有12个：子丑寅卯辰巳午未申酉戌亥，将天干的10个汉字和地支的12个汉字分别循环排列成如下两行：一次，他在核实数据时，认为部分数据需要重新测量，但项目部的车都被派出去了。belimitedtonomorethan2daysofwork,materialdepositedinspecialinsulatedcontainers,materialhandlingtogentlyandmakeuseofthermalinsulationmaterialinwindproof,waterproof,moisture-proofmeasure.6.2thermaldesignoptimizationforhigh-temperaturespecialthermalinsulationforpipingsupportandhangerdesign,reducedheatdissipationofthehangers,ensurethatthewalldoesnotoverheat.Small-diameterpiping,thermalinstrumentlayoutandpositioningofsupportandhangerdesigntakefullyintoaccounttheexpansionspaceandinsulationthickness.Large-diameterpipesafterheatpreservationplasteringconstructionofvalves,turbine,checkingsmoothsurface,hightemperaturepowderpaintfullydryafter.Protectivecoveringsforelectricequipmentinsulationboardsdesignedwithpressureplate,whenorderingaccordingtotheinstallationdiagram,modelspecificationspublishingorder,ensurewheninstallingcornersneat,uniformappearance,reducetheamountofon-sitemachining.Beforevalves,flangeinsulationshellconstruction,besuretomakeaunifiedmodel,allvalves,flanges,insulationcoverunified,tidyandbeautiful.Whenfourpartssuchaspipes,boilerinsulation,mustdofirstarticleinspection,proofofdesignandconstructionmethods,technologycanmeetthetechnologicalrequirements,beforeextensiveconstruction.Boilersteelbeams,dooropeningboxesdesignedwithinsulationgaskets,flangecannotbeoblique,evenfastened.Backintotheslopeofthetubingduringinstallationpayattentiontothepiping,oilstationisalowpoint.Refuelingmustbecontrolledwhencastingmaterialparts,selectlowthermalconductivitymaterialsasfaraspossible,ensurethatthesepartsdonotoverheat.6.3qualitydefectsofinsulationtechnologymanagementoptimizationofconstructionprocessanddevelopareasonableduration,regionaltransferofstrictly甲乙丙丁戊己庚辛壬癸甲乙丙丁戊己庚辛壬癸……子丑寅卯辰巳午未申酉戌亥子丑寅卯辰巳午未申酉戌亥……从左向右数，第1列是甲子，第2列是乙丑，第3列是丙寅……，则当第2次甲和子在同一列时，该列的序号是（）A.31B.61C.91D.121二、填空题（共12个小题，每小题4分，共48分）9，如果m、n满足23m-6+n+4=0，则mn=__________.10，定义a*b=ab+a+b,若3*x=27，则x的值是________。11．观察数组：（1），（4，7），（10，13，16），（19，22，25，28），……，则2008在第组。12．已知a、b是一元二次方程012xx的两个根，则代数式baba232322的值等于.13．如图，已知AE平分∠BAC，BE⊥AE于E，ED∥AC，∠BAE＝36°，那么∠BED＝°．第14题14．如图，边长分别为1、2、3、4、……2007、2008的正方形叠放在一起，则图中阴影部分的面积和为。15，如右图所示，矩形ABCD被分成一些正方形，已知AB=32cm，则矩形的另一边AD=______cm。第15题ABCDE第13题图第16题一次，他在核实数据时，认为部分数据需要重新测量，但项目部的车都被派出去了。belimitedtonomorethan2daysofwork,materialdepositedinspecialinsulatedcontainers,materialhandlingtogentlyandmakeuseofthermalinsulationmaterialinwindproof,waterproof,moisture-proofmeasure.6.2thermaldesignoptimizationforhigh-temperaturespecialthermalinsulationforpipingsupportandhangerdesign,reducedheatdissipationofthehangers,ensuretha