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甲、乙两人进行射击测试，每人20次射击成绩的平均数都是8.5环，方差分别是：S甲2＝3，S乙2＝2.5，则射击成绩较稳定的是 （填“甲”或“乙”）．
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在一次射击训练中甲乙两人各射击10次两人10次射击成绩的平均数均是9.1环方差分别是则关于甲乙两人在
甲比乙稳定
乙比甲稳定
甲和乙一样稳定
甲、乙稳定性没法对比
甲乙两人进行射击测试每人10次射击成绩的平均数都是8.5环方差分别是S.甲2=2S.乙2=1.5则射
甲乙两名射击运动员在某场测试中各射击10次两人的测试成绩如下甲778889991010乙777889
.甲乙丙三人进行射击测试每人10次射击成绩的平均数均是9.1环方差分别为则三人中射击成绩最稳定的是.
甲乙两人进行射击测试每人10次射击成绩的平均数都是8.5环方差分别是S＝4S＝4.5则射击成绩较稳
甲乙两人在一次射击比赛中各射靶5次两人成绩的条形统计图如图所示则
甲的成绩的平均数小于乙的成绩的平均数
甲的成绩的中位数等于乙的成绩的中位数
甲的成绩的方差小于乙的成绩的方差
甲的成绩的极差小于乙的成绩的极差
甲乙两人各射击6次甲所中的环数是855ABC且甲所中的环数的平均数是6众数是8乙所中的环数的平均数是
甲射击成绩比乙稳定
乙射击成绩比甲稳定
甲．乙射击成绩稳定性相同
甲．乙射击成绩稳定性无法比较
甲乙两人进行射击测试每人10次射击成绩的平均数都是8.8环方差分别是S甲2＝1S乙2＝0.8则射击
甲乙两人进行射击测试每人10次射击成绩的平均数都是8.8环方差分别是S.甲2=1S.乙2=0.8则射
甲乙两名学生进行射击练习两人在相同条件下各射靶5次射击成绩统计如下从射击成绩的平均数评价甲乙两人的射
甲比乙高
甲、乙一样
乙比甲高
不能确定
甲乙丙丁四人进行射击测试每人10次射击成绩的平均数都约为8.8环方差分别为则四人中成绩最稳定的是
甲
乙
丙
丁
甲乙两人进行射击测试每人20次射击成绩的平均数都是8.5环方差分别是S甲2=3S乙2=2.5则射击
甲乙两人进行射击测试每人10次射击成绩的平均数都是8.5环方差分别是S甲2=2S乙2=1.5则射击成
甲乙两人进行射击测试每人20次射击成绩的平均数都是8.5环方差分别是S.甲2=3S.乙2=2.5则射
甲乙丙丁四人进行射击测试每人10次射击成绩平均数均是9.2环方差分别为则成绩最稳定的是
）甲 （
）乙 （
）丙 （
）丁
甲乙两名学生进行射击练习两人在相同条件下各射击5次射击成绩统计如下从射击成绩的平均数评价甲乙两人的射
甲比乙高
甲、乙一样
乙比甲高
不能确定
甲乙丙三人进行射击测试每人10次射击成绩的平均数都为8.8环方差分别为s甲2=0.016s乙2=0.
甲
乙
丙
不能确定
在一次射击训练中甲乙两人各射击10次两人10次射击成绩的平均数均是9.1环方差分别是则关于甲乙两人在
甲比乙稳定
乙比甲稳定
甲和乙一样稳定
甲、乙稳定性没法对比
甲乙两人进行射击测试每人10次射击的平均数都是8.8环方差分别为S=0.63S=0.48则二人中成
甲乙两人进行射击测试每人10次射击成绩的平均数都是8.5环方差分别是＝2＝1.5则射击成绩较稳定的是
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已知am=3an=2则a2m-n的值为
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如图数轴上表示1的对应点分别为点A点B．若点A是BC的中点则点C所表示的数为 A． B． C． D．
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求下列各式中未知数的值|a-2|=
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若=2=-3则b-a的值是
计算-3a42-a·a3·a4-a10÷a2
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计算
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化简---|-3|=
8分MarylandisexpectedtobecomethefirststateoftheUSAtobanfoam泡沫橡胶foodpackagingtakeoutcontainersandcups.Thenewproposedlawpassedbothofthestate'slegislativebodies立法机关thisweekwithenoughvotestooverrideapotentialrejectionsignedbyGov.LarryHoganwhohasnotpubliclysignaledwhetherhesupportedthelawornot.Thelawwouldbecomethelatestinagrowingeffortworldwidetobankindsofsingle﹣useplasticproductsduetotheirimpactsontheenvironment. WiththestatewidepreviousbaneffortMaryland'stwocountiesPrinceGeorgeandMontgomeryhadalreadybannedfoampackaging.Del.BrookeLiermanwhointroducedsimilarlegislationlastyearandin2017sayschangingpublicopinionhelpedherthirdattemptsucceed. Ithinkwehavereachedadangerpointshesays.Peopleareseeinghowcommonsingle﹣useplasticsareandthattheyarenotrecyclableandnevergoingaway.Peoplearebeginningtounderstandtheimportanceoflivingmoresustainably. Thenewlawwouldbanfoamfoodpackagingforproductspackagedin﹣stateincludingrestaurantscafesfoodtrucksandgrocerystores.Thefinalversionofthebillincludesexceptionssuchasmeat.ThebanwouldgointoforceonJuly12020andwouldcarryfinesof﹩250. ThelegislationwasopposedbytheMarylandRetailersAssociationwhichwarnedthatoutlawingfoampackagingcouldhurtsmallbusinessesbyhighercosts.Foampackagingremainspopularamongrestaurantsandthefoodindustrybecauseitislightweightinexpensiveandkeepsfoodanddrinkshot. Foamfoodcontainershavebeenbannedincitiesorcountiesin11statesincludingSeattlePortlandWashingtonD.C.SanFranciscoandnumerousothercitiesinCalifornia.AbaninNewYorkCitytookeffectatthebeginningofthisyearafteralonglegalbattleendedlastsummer. 1HowdidMarylandcarryoutthebanoffoamfoodpackaging A.Bypassinganewlaw. B.Byfiningfoampackagingusers. C.Byclosingsomelocalcompanies. D.Byteachingpeopletofocusontheenvironment. 2Whatdoestheunderlinedwordoverrideinparagraph1mean A.Explain. B.Prove. C.Reject. D.Tolerate. 3WhatisthekeytothethirdsuccessaccordingtoDel.BrookeLierman A.Learningfromothercities. B.Gettingmedium'ssupport. C.Changingpublicopinion. D.Hurtingsmallbusinesses. 4Whatcanwelearnfromthetext A.Foamfoodpackageswilldisappearintheworld. B.PeopleinMarylandsupportthelawabsolutely. C.Foamfoodpackageshaven'tanyadvantageatall. D.MeatwillbeallowedtobesoldinfoamfoodpackagesinAmerica.
已知5x-1的平方根是±34x+2y+1的立方根是1求4x-2y的平方根．
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10分Itisimportanttoteachyourdogtoguardyouandtheothermembersofyourfamilytofightagainstdanger.Herearesometipsonhowtotrainyourdogtoprotectyou. 1. Itisveryimportanttointroduceyourdogtootherpeopleandletitinteractwiththem.Agoodguarddogisfriendlytothepeoplearoundit.Thisexerciseisveryimportantbecauseitwillhelpthedogdistinguishbetweengoodpeopleandbadpeople.2. Usepropercommands Adogactsaccordingtohowithasbeentrained.Theonlywaytodothisisthroughcom﹣mandsandyourownbodyactionsandsounds.CommandthedogtoattackbysayingthewordAttackloudly.SoonwheneveryouusethecommandAttack!yourdogwillunderstandthatitneedstofightthethingyouarepointingat.3youmustalsotrainittostoptheattack. Teachnightguarding Teachyourdogtokeepacheckonthehousebytakingitaroundthehouseandmakingitsniffthearea.Youwillneedtodothisacoupleoftimessothatthedogunderstandsthatitneedstokeepacheckeverynight.4.Itwillcheckthehouseandreturnbackindoors. Rewarditforitsgoodbehavior GivingrewardssuchasapatahugverbalpraiseGooddog!ortreatsisanexcellentwayoflettingthedogknowthatyouarehappywithitsbehavior.5itisyourdutytomakesureyourdogisrewardedforitsgoodbehaviorandpunishedforitsbadbehavior.PunishmentinvolvesscoldingthedogbyusingthecommandBaddog!orNoverybad!Thiswillhelpthedoglearnthatitmustn'tdocertainthings. A.Sinceyouarethemaster B.Encouragecommunication C.Whileyouaretrainingthedogtoattack D.Trainanolderdogtoprotectitsmaster E.Afterafewdaysthedogwillbegintocheckonitsown F.Peoplewhoaregoodwillbethosewhoareallowedtocomeclosetoit G.Ifyourdogdoesnotcomeinsideyouwillneedtocommandittogetback
10分假定英语课上老师要求同桌之间交换修改作文请你修改你同桌写的以下作文.文中共有10处语言错误每句中最多有两处.每处错误仅涉及一个单词的增加删除或修改. 增加:在缺词处加一个漏字符号∧并在其下面写出该加的词. 删除:把多余的词用斜线\划掉. 修改:在错的词下划一横线并在该词下面写出修改后的词. 注意: 1.每处错误及其修改均仅限一词; 2.只允许修改10处多者从第11处起不计分. I'vehadmanydreamssinceIwasachild.Nowmydreamistoopensacafe.Thoughitmayappearsimpleitrequiredalotofideasandefforts.WhatIwantisnotjustanordinarilycafebutaveryspecialone.IwantmycafehaveaspecialthemesuchaslikeTangDynasty.Inthecafecustomerswillenjoyyourselvesinthehistoricalenvironmentwhatiscreatedforthem.IfIsucceedinmanageoneIwillopenmore.Iwishtohaveachainofcafesinmanydifferentcity.Eachofmycafeswillhaveadifferentthemeandanuniquestyle.
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的平方根是
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