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在m÷n＝8…3中，把m、n同时扩大10倍，商是 ，余数是 ．
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在化学反应A+2B＝C+2D中m克A物质与n克B物质恰好完全反应生成e克C物质则同时生成的D物质质
m+2n﹣e
m+n﹣2e
m+n﹣e
若分式中的mn的值同时扩大到原来的10倍则此分式的值
不变
是原来的20倍
是原来的10倍
是原来的
在a÷b=36如果被除数除数同时扩大10倍那么它的结果是
商3余6
商30余6
商3余60
商30余60
把分式中的字母m扩大3倍而n缩小到原来的三分之一则分式的值
不变
扩大3倍
扩大9倍
是原来的三分之一
用代数式表示m的3倍与n的差的平方正确的是
(3m－n)
2
3(m－n)
2
3m－n
2
(m－3n)
2
下列用代数式表示数量关系不正确的是
m的2倍与n的3倍的和是2m+3n
a．b两数的和与这两数差的积是（
a+b
）（
a-b
）
a与b的和的
是a+
b
被3除商m余2的数是3m+2
若将分式amn均为正数中的字母amn的值分别扩大为原来的2倍则分式的值为
扩大为原来的2倍
缩小为原来的
不变
缩小为原来的
如果把分式中的m和n都扩大3倍那么分式的值
不变
扩大3倍
缩小3倍
扩大9倍
如果把分式中的m和n都扩大2倍那么分式的值
不变
扩大2倍
缩小2倍
扩大4倍
已知m除以5余1n除以5余4如果3m>n求3m-n除以5的余数.
计算x2-3x+nx2+mx+8的结果中不含x2和x3项则mn的值为
m=3，n=1；
m=0，n=0；
m=-3，n=-9；
m=-3，n=8；
用代数式表示m的3倍与n的差的平方正确的是
（3m﹣n）
2
3（m﹣n）
2
3m﹣n
2
（m﹣3n）
2
在m÷n=83中把mn同时扩大10倍商是余数是．
1体积相同浓度均为0.2mol·L－1的盐酸和CH3COOH溶液分别加水稀释10倍溶液的pH分别变成
在m÷n=93中把mn同时扩大10倍商是余数是．
如果把分式中的m和n都扩大3倍那么分式的值
不变
扩大3倍
缩小3倍
扩大9倍
如果把分式中的m和n都扩大3倍那么分式的值
不变
扩大3倍
缩小3倍
扩大9倍
如果把分式中的m和n都扩大3倍那么分式的值
不变
扩大3倍
缩小3倍
扩大9倍
1体积相同浓度均为0.2mol·L－1的盐酸和CH3COOH溶液分别加水稀释10倍溶液的pH分别变成
若分式中的mn同时扩大2倍则分式的值
扩大两倍
不变
缩小两倍
无法确定
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Thesystemhasbeendesignedtogivestudentsquickandeasytothedigitalresources资源ofthelibrary.A.access B.passage C.way D.approach
如图为一辆正在匀速行驶喷射水雾的环保车它的动能选填“增大”“减小”或“不变”水雾喷出后一会儿就消失了其中发生的物态变化是此过程需要热．
inmylifeimpressedmesodeeplyasmyfirstvisittothePalaceMuseum.A.Anything B.Nothing C.Everything D.Something
WhenJohnwasgrowingupotherkidsfeltsorryforhim.Hisparentsalwayshadhimweedingthegardencarryingoutthegarbageanddeliveringnewspapers.ButwhenJohnreachedadulthoodhewasbetteroffthanhischildhoodplaymates.Hehadmorejobsatisfactionabettermarriageandwashealthier.Mostofallhewashappier.Farhappier. Thesearethefindingsofa40—yearstudythatfollowedthelivesof456teenageboysfromBoston.Thestudyshowedthatthosewhohadworkedasboysenjoyedhappierandmoreproductivelivesthanthosewhohadnot.Boyswhoworkedinthehomeorcommunitygainedcompetence能力andcametofeeltheywereworthwhilemembersofsocietysaidGeorgeVaillantthepsychologist心理学家whomadethediscovery.Andbecausetheyfeltgoodaboutthemselvesothersfeltgoodaboutthem. Vaillant'sstudyfollowedthesemalesingreatdetail.Interviewswererepeatedatages2531and47.UnderVaillanttheresearcherscomparedthemen'smental—healthscoreswiththeirboyhood—activityscoreswiththeirboyhood—activityscores.Pointswereawardedforpart—timejobshouseworkeffortinschoolandabilitytodealwithproblems. Thelinkbetweenwhatthemenhaddoneasboysandhowtheyturnedoutasadultswassurprisinglysharp.Thosewhohaddonethemostboyhoodactivitiesweretwiceaslikelytohavewarmrelationswithawidevarietyofpeoplefivetimesaslikelytobewellpaidand16timeslesslikelytohavebeenunemployed.TheresearchersalsofoundthatIQandfamilysocialandeconomicclassmadenorealdifferenceinhowtheboysturnedout.Working————atanyage————isimportant.Childhoodactivitieshelpachilddevelopresponsibilityindependenceconfidenceandcompetence———theunderpinnings基础ofemotionalhealth.Theyalsohelphimunderstandthatpeoplemustcooperateandworktowardcommongoals.Themostcompetentadultsarethosewhoknowhowtodothis.Yetworkisn'teverything.AsTolstoyoncesaidOnecanlivemagnificentlyinthisworldifoneknowshowtoworkandhowtolovetoworkforthepersononelovesandtoloveone'swork. 1WhatdoweknowaboutJohn? A.Heenjoyedhiscareerandmarriage. B.Hehadfewchildhoodplaymates. C.Hereceivedlittlelovefromhisfamily. D.Hewasenviedbyothersinhischildhood. 2Vaillant'swordsinParagraph2serveas. A.adescriptionofpersonalvaluesandsocialvalues B.ananalysisofhowworkwasrelatedtocompetence C.anexampleforparents'expectationsoftheirchildren D.anexplanationwhysomeboysgrewintohappymen 3Vaillant'steamobtainedtheirfindingsby. A.recordingtheboys'effortinschool B.evaluatingthemen'smentalhealth C.comparingdifferentsetsofscores D.measuringthemen'sproblemsolvingability 4WhatdoestheunderlinedwordsharpprobablymeaninParagraph4? A.Quicktoreact B.Havingathinedge C.Clearanddefinite D.suddenandrapid 5Whatcanbeinferredfromthelastparagraph? A.Competentadultsknowmoreaboutlovethanwork. B.Emotionalhealthisessentialtoawonderfuladultlife. C.Lovebringsmorejoytopeoplethanworkdoes. D.Independenceisthekeytoone'ssuccess.
根据小磁针静止时所指方向在图中画出通过小磁针中心的一条磁感线并标出电源的正极．
如图是水位自动报警器的原理示意图下图四个实验能反映其自动报警原理的是
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是a+b 被3除商m余2的数是3m+2
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