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某公司对2019年1～4月份的获利情况进行了数据统计，如表所示： 利用线性回归分析思想，预测出2019年8月份的利润为11.6万元，则y关于x的线性回归方程为
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高三下学期数学《》真题及答案
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某农科站技术员为了解某品种树苗的生长情况在该批树苗中随机抽取一个容量为100的样本测量树苗高度单位cm．经统计高度均在区间[2050]内将其按[2025[2530[3035[3540[4045[4550]分成6组制成如图所示的频率分布直方图其中高度不低于40cm的树苗为优质树苗．1求频率分布直方图中a的值2已知所抽取的这100棵树苗来自于甲乙两个地区部分数据如下2×2列联表所示将列联表补充完整并根据列联表判断是否有99.9%的把握认为优质树苗与地区有关附K2＝其中n＝a+b+c+d
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某几何体的三视图如图所示则该几何体的表面积为
设变量xy满足约束条件则目标函数z＝3y﹣x的最小值是
在直角坐标系xOy中直线l的参数方程为t为参数a∈R以O为极点x轴正半轴为极轴建立极坐标系曲线C的极坐标方程为ρsin2θ＝2cosθ1求直线l的普通方程及曲线C的直角坐标方程2若直线l过点P11且与曲线C交于AB两点求|PA|+|PB|
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已知函数fx＝若Fx＝fx+m有两个零点x1x2则x1x2的取值范围是
设函数fx＝|x﹣1|+|x+a|a∈R． 1若不等式fx≥6的解集为﹣∞﹣4]∪[b+∞b＞﹣4求ab的值 2若fx≥a|x|对任意x∈R恒成立求a的取值范围．
6分 SummerCamps Makeyoursummermagicalwithaone﹣of﹣a﹣kindsummercampexperience! Half﹣dayweek﹣longcampsareheldfrom9am﹣12pmor1pm﹣4pm. Dailysnackswillbeprovidedandevenbecomepartofthehands﹣onfun! Session1﹣﹣﹣OceanCommotion暴动 Setsailforfunandadventureonthedeepbluesea!CampersexploreunchartedlandatTheMagicHouseanddiscoversomethingfishyastheycomeintotheexcitingworldofseacreatures. June6﹣10 June13﹣17 June20﹣24 Session2﹣﹣﹣SuperkidsExploreEarth Campersbecomesuperheroestotheearthastheylearnabouttheenvironmentanddiscoverhowtousetheirsuperpowerstoprotectit!Duringthisaction﹣packedweekcamperswillexploretheearthfromtheskytotheseaandparticipateinfunearth﹣friendlyactivitiessuchasturningtrashintotreasure. June27﹣July1 July11﹣15 July18﹣22 Session3﹣﹣﹣OnceUponATime Atthisuniquefairytale﹣themedcampcampershaveamagicalmake﹣believeadventurethroughthepagesofsomeoftheirfavoritestorybooks.Campersexperiencegaint﹣sizedfunastheyusetheirimaginationstotraveltoplacesfoundonlyinfairytales. July25﹣29 August1﹣5 August8﹣12amsessionsonly Allcampersmustberegisteredinadvance. 1Whatdoestheunderlinedwordone﹣of﹣a﹣kindinParagraph1mean A.Long B.Unique C.Official D.Moving 2WhatisthemainpurposeofSession2 A.Toencouragereading. B.Toinspireimagination. C.Todevelopthespiritofadventure. D.Toraiseenvironmentalawareness. 3WhatdocampersprobablydoduringSession3 A.Readfairystories. B.Travelthecountry. C.Searchfortreasure. D.Learnaboutanimals.
30分ThestagelightsdimmedandItookaquicklookfrombehindtheheavyblackcurtainsintothe1.BlindedbythelightsIquickly2.Itseemsthatagreatnumberofeyeswerelookingatme.Itookadeep3asthemusicofmydancebegantoplay.Ienteredthestageandbeganmy4thegraduationtestoftheclassicalIndiandance. AfteradecadeoflearningthisartformIhad5beenconsideredreadytotakeonthemostdifficultact.Thetestisthemostimportanteventinadancer'slifeasitpays6toallthefactorsinone'slifethat7thedanceformone'scultureandfamily. Theperformanceisundertakenonlybythemost8anddeterminedstudents.Itisadifficultprocessthatrequiresmuchcommitment.FormorethansixmonthsIspenttwotothreehourseveryday9thesedances.ManytimesI10myselftomyphysicalandmentalbreakingpointbutstillIwouldnotstop.Icouldnotgiveup.Therewasalwayssomuchmoretodoandsomuchmoreto11. I12alotaboutmyselfinthosetiringhours.IlearnedthatIwasfartoo13togiveupandIwastooproudtoprovemyself14afterIhadsetanunrealisticgoal.Evenwithphysicalpainandmental15Iforcedmyselftomeetmy16.EvenwhenIwasattheendofmy17therewasalwayssomethingdrivingmeonforcingmenottogiveup. FortunatelyImadeit.WhatIhaddone18thesuccess.ItwasinthosehoursthatIlearnedwhatadancer19is.ThosetimewasevidencethatIcould20somethingIsetouttodo. 1A.carpenter B.audience C.actress D.Diver 2A.pulledback B.setoff C.reachedout D.brokeaway 3A.sleep B.thought C.breath D.sorrow 4A.career B.attempt C.response D.performance 5A.easily B.eventually C.occasionally D.directly 6A.debt B.visit C.interest D.respect 7A.develop B.rescue C.introduce D.convince 8A.focused B.beautiful C.intelligent D.considerate 9A.recording B.practicing C.discussing D.designing 10A.applied B.addicted C.treated D.pushed 11A.forget B.design C.learn D.research 12A.regretted B.discovered C.controlled D.confused 13A.brilliant B.brave C.stubborn D.discourage 14A.wrong B.nervous C.frightened D.careless 15A.function B.action C.level D.stress 16A.budget B.expectation C.cost D.deadline 17A.limit B.purpose C.preparation D.destination 18A.increased B.deserved C.expanded D.exposed 19A.completely B.chiefly C.truly D.originally 20A.change B.supply C.explain D.achieve
如图网格纸上小正方形的边长为1粗实线画出的是某几何体的三视图则该几何体的体积为
已知函数fx＝x3﹣2x则曲线y＝fx在点1f1处的切线的倾斜角是
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