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利用二次函数图象的草图求出下列不等式的解集要求在画出草图．-x²+2x+3＞-1
Bobneedshismathtforthenextclassbuthecan'tfindit.
计算²=
=．
抛物线y=ax²+bx+c图象如下则关于x的方程ax²+bx+c-3=0的根的情况是．
Couldyoupleasereaditsothatwecanhearitclearly?
因为-5²=25所以-5是的平方根．因为5²=25所以5是的平方根．所以25的平方根是
的算术平方根是
=
15分WhenRobertLeewasinprimaryschoolhehatedtoseehisclassmatesthrowingawayhalf﹣eatensandwichesafterlunch.Hisparentshadtaughthimandhisolderbrothernottowastefood.TheysaiditwasbadsaysRobert27. While1studyfinanceandaccountingatNewYorkUniversityRobertrememberedthislessonandjoinedTwoBirdsOneStoneafood﹣rescueclubatschool2deliveredfivedaysaweekuneatenpastavegetablesandotherleftovers剩余食物fromthedininghalltonearbyhomeless3shelter. WhenRobertandfellowclubmemberLouisaChenenteredacollege4competetheycameupwithaslightlydifferentideaforafood﹣rescuenon﹣profitgroup﹣5theyprogramwouldn'thaveadonationminimumwouldoperatesevendaysaweekandwouldbestaffed6entirebyvolunteers. Surprisingly7ideastoodout.RobertandLouisaChenwonthefirstplace.8the$l000prizetheyfoundedRescuingLeftoverCuisineRLCinJuly2013.InjustthefirstfewweeksRobert'steamdeliveredadonationofenoughnoodlesandmeatballstofeed20peopleinlineataNewYorkCityhomelessshelterthathadrunoutoffood.OnlyayearintohisfinancejobRobertgaveuphissix﹣figuresalary9focusonRLC.Sofartheorganization10reachsixteencitiesaroundthecountry.
-=
²=
±=
10分Weautomaticallyassumethatasadultswe'rewiserthanwhenwewerechildren.Howeveractuallywecanlearnalotfromourchildhoodself.Forexamplewecanlearntodevelopoptimismaboutthefuture.DoyourememberhowexcitedyouusedtobejustbeforeChristmas?1Reintroducethatchildlikewonderintoourdailyexperiences. Wecanlearntodreambigandimaginetheimpossible.HowoftenhaveyouheardachildsaysomethinglikeOnedayI'mgoingtobeanastronaut?Ouradultmindsimmediatelylaughatthisideaandthinkaboutallthelogicalreasonsastowhythismightneverhappen.2Weminimizeourchancesofattainingwhatwedreamabout.Itisokaytodreambigjustasourchildhoodselfdid. 3Ourchildhoodselflookedatpossibilitiesandbelievedwecouldachievethemsuccessfully.Ifwewantedtobuildatreehousewe'dgoaboutthinkingabouthowtomakeithappeninsteadoffocusingonallthereasonsitmightnothappen.Inthiswaywecanfillourlifewithpossibilitiesratherthanregrets. Wecanlearntobeplayfulandsillysometimes4Childrenspendalargeamountoftimeescapingfromrealitytomessaboutandhavefun.Maketimeforyourchildhoodselftocomeoutandplay.Runaroundthegardenwearasillyhatorspendtimelaughing.5. A.Don'timaginethingscouldgowrong. B.Wecanlearntoholdacandoattitude. C.Thatfeelingofgreatjoyishardtobeat. D.Mostchildrentendtothinkinapositiveway. E.Alloftheseactivitiescanmakeusfeelhappyandalive. F.Weemployself﹣limitingbeliefswithoutevenrealizingit. G.Allworkandnoplaymakesapersonverydullandupset.
-²=
已知2＜x＜3化简+|x-3|
25分假定你是李华你的英国朋友Mike发邮件说他打算今年暑假来中国学习中国剪纸Chinesepapercutting.请你回复邮件内容包括 1.表示欢迎 2.给出学习建议观看剪纸展览学习一门剪纸课程. 注意1.词数100左右 2.可以适当增加细节以使行文连贯.
观察下列各式请你猜想1==．2请你将猜想到的规律用含有自然数nn≥1的代数式表达出来．
²=
已知抛物线y=ax²+bx+c的对称轴是直线x=2它与x轴的一个交点坐标是40则方程ax²+bx+c=0的两个解是．
计算=
=
Don'treadwordword.Readwordgroups.
It'shardimprovemywritingskills.
PM2.5是指直径小于或等于2.5μm的细小颗粒物空气中PM2.5的运动属于/不属于分子热运动．
根据如图所示的现象填写结论．如图所示接触面磨平的两块铅柱用力压紧可以使它们结合在一起而且在铅柱下面悬吊一定的重物它们也不会分开．这说明分子间存在．
²=
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