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把下列各式分解因式4x2-4xy+8xz
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下列各式分解因式正确的是
a
2
+b
2
=(a+b)
2
xy+xz+x=x(y+z)
x
2
+x
3
=x
3
(
+1)
a
2
﹣2ab+b
2
=(a﹣b)
2
下列各式分解因式正确的是
x
2
+6xy+9y
2
=(x+3y)
2
2x
2
﹣4xy+9y
2
=(2x﹣3y)
2
2x
2
﹣8y
2
=2(x+4y)(x﹣4y)
x(x﹣y)+y(y﹣x)=(x﹣y)(x+y)
下列各式可以用完全平方公式分解因式的是
x
2
-4x+4
1+4x
2
4y
2
+4y-1
x
2
+xy+y
2
把下列各式进行因式分解x3+3x2y+2xy2
下列各式从左到右的变形中是因式分解的为
a
2
+b
2
=(a+b)
2
a
2
﹣2ab+b
2
=(a﹣b)
2
x
2
+x
3
=x
3
(
+1)
x(y+z+1)=xy+xz+x
把下列各式分解因式 -x2+xy-xz
把下列各式分解因式.1-xy1-xy-x3y3.
下列各式能用完全平方公式分解因式的是
x
2
+2xy-y
2
x
2
-xy+4y
2
x
2
-xy+
x
2
—5xy+10y
2
下列各式能用完全平方公式分解因式的是
x
2
+2xy-y
2
x
2
-xy+4y
2
x
2
-xy+
x
2
—5xy+10y
2
各式因式分解-36x2+12xy-y2
直接写出下列各式分解因式的结果x2-4xy-4+4y2=__________.
把下列各式分解因式x2+y2+m2-2xy+2my-2mx.
下列从左到右的变形正确进行因式分解的是
(x+5)(x-5)=x
2
-25
x
2
+x+1=x(x+1)+1
-2x
2
-2xy=-2x(x+y)
3x+6xy+9xz=3x(2y+9z)
下列各式分解因式正确的是
a
2
﹣b
2
=(a﹣b)
2
a
2
﹣2ab+b
2
=(a﹣b)
2
xy+xz+x=x(y+z)
下列各式中不能继续分解因式的是
8xy-6x
2
=2(4xy-3x
2
)
3x-
xy=
x(6-y)
4x
3
+8x
2
+4x=4x(x
2
+2x+1)
16x
2
-4=4(4x
2
-1)
下列各式由左到右的变形是因式分解的是
xy
2
+x
2
y=xy(x+y)
(x+2)(x-2)=x
2
-4
b
2
+4b+3=b(b+4+
)
a
2
+5a-3=a(a+5)-3
下列各式从左到右是因式分解的是
(y﹣1)(y+1)=y
2
﹣1
x
2
y+xy
2
﹣1=xy(x+y)﹣1
(x﹣2)(x﹣3)=(3﹣x)(2﹣x)
x
2
﹣4x+4=(x﹣2)
2
下列各式因式分解错误的是
8x
2
y-24xy
2
=8xy(x-3y);
ax+bx+ay+by=x(a+b)+y(a+b)
12x
2
y+14x
2
y
2
-2xy=2xy(6x+7xy-1);
x
3
-8=(x-2)(x
2
+2x+4)
直接写出下列各式分解因式的结果4x2+2xy+y2=__________.
下列各式由左到右的变形是因式分解的是
xy
2
+x
2
y=xy(x+y)
(x+2)(x-2)=x
2
-4
b
2
+4b+3=b(b+4+
)
a
2
+5a-3=a(a+5)-3
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25分假如你是一名高二的学生名叫李华.请你就本校食堂存在的问题向校长写一封投诉信.内容包括: 1.投诉的原因; 2.投诉的具体问题2﹣3点; 3.提出合理的建议. 注意:1.词数100左右;开头和结尾已经给出不计入字数; 2.可以适当增加细节以使行文连贯. DearHeadmaster I'mLiHuaaSenior2student. SincerelyYours LiHua
30分OnemonthagoSarahboughtalipstick口红shehaddesired.It'snot1butitmadeherhappybecauseitwastheonethatshehadbeen2sinceshesawit.Everymorningwhenshe3hermakeupeverythingseemsbrandnewduetothislipstick.Itfeelslikethatthewholedayisfullof4.Sarahhaslongbeenaccustomedto5herselfthroughshopping.Andthisdesireformaterialpossession6hertoworkhard.Shefeels7aboutthis.Her8keepsgettingbetterallbecauseofthiskindofdesire.Buthermotherthinksquite9.Severaldaysagowhenhermothercametoknowthe10ofthelipsticktheykept11foralmostawholeday.Hermotherthoughtthatitwas12wrongtospendsomuchonsuchmeaninglessitemswhileSarahthoughthermotherwastotally13aboutit.WhatSarahdidn'tknowwasthathermotherhadoncebeenalittlegirlwhohad14inpovertyandstarvation.Thatlittlegirlcouldnotfindenoughclothesto15inwinter.Thatgirlneededtolearnhowtospendeverypenny16itweretwoinordertosurvive.It'sjust17thattwopeoplecan'tunderstandeachotherevenformotheranddaughterbecauseeverybody's18isdifferent.Trytobepatientwiththepeoplearoundyou.Trytogetto19them.Trytostandintheirshoes.Ifyoucannotlistentopeoplehowcanyou20themtolistentoyou1A.dear B.cheap C.famous D.handy2A.longingfor B.headingfor C.leavingfor D.payingfor3A.putsoff B.putsaway C.putson D.putsback4A.anxiety B.hate C.laughter D.hope5A.rewarding B.devoting C.adapting D.forgiving6A.warns B.persuades C.begs D.drives7A.cautious B.good C.stressed D.negative8A.career B.relationship C.life D.study9A.firmly B.differently C.logically D.obviously10A.quality B.brand C.material D.price11A.waiting B.quarreling C.shopping D.gossiping12A.probably B.approximately C.slightly D.completely13A.unreasonable B.uncomfortable C.enthusiastic D.curious14A.turnedup B.brokenup C.grownup D.keptup15A.wear B.sell C.exchange D.clean16A.eventhough B.incase C.asif D.sothat17A.unlikely B.necessary C.strange D.natural18A.experience B.knowledge C.character D.family19A.move B.forgive C.know D.copy20A.force B.expect C.order D.advise
10分Therehavebeenalotofcommentsrecentlysurrounding5Gthenextgenerationofwirelesstechnology.1Howmightitchangeourlives 5Gstandsforfifthgenerationmeaningthenextstepintheprogressionoftechnologytoreplacethecurrent4Gsystem.EarlierGsystemsweredesignedtoimprovemobilecommunicationoperations.Eachnewtechnologybroughtmajorimprovementsinspeedandgreatlyincreasednetworkcapacity容量.2.Itisexpectedtopermitmoreuserstodomorethingsatafasterrate. Howevertechnologyexpertssaythereisamajorwaythat5Gisdifferentfromtheearliersystems.3.ItwillaffectmanymoredevicesandindustriesthanotherGversions. 5Gwillhelpfuelfuturesmartcitiesbyconnectingsensornetworks.5Gisalsoexpectedtoconnectself﹣drivingcarsandsupportnewtechnologiesinvolvingvirtualreality虚拟现实.Higher5Gspeedscouldalsopermitdoctorstocommonlyperformremotemedicaloperations.Factoriesandbusinessescoulduse5Gtechnologytoincreaseautomationandimprovethecollectionofinformation. 4.Theincreaseddataflowacross5GnetworkswouldgiveInternetattackersalotmorepossibilitiestostealandmisusedata.Inadditionthewideruseofa5Gwirelessnetworkmeansanybreakdownofthesystemwouldhavemorewidespreadandsevereresults.Suchdifficultiescouldaffectpublicsafety.5oranetworkbreakdowncouldcauseself﹣drivingvehiclestocrash. A.Whyis5Gsopopular B.Whatisthistechnology C.Everycoinhastwosides D.Thenew5Gsystempromisesmoreofthesame E.Itwillmovebeyondmobilenetworktechnology F.Abreakdownof5Gnetworksmaycauseeconomiclosses G.Afailureduringadoctor'sremoteoperationcouldleadtodeath
1分WhathesaidmeandIwasataloss. A.confused B.amazed C.amused D.brightened
1分Thankstothisnewvaccine疫苗theUNhasmoretoolsinthebattletotheworldofoneofitsmostterrifyingdiseases.
1分Youngpeoplemaketheirparentsangrywiththeirchooseinclothesinentertainmentandinmusic.
1分CharlieChaplinislovedandrememberedasagreatactorwhocouldinspirepeoplegreatconfidence.
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