人教版八年级下册数学测试题

Dothefollowingthreemainpoints:1findouttheweak.Reviewprocessistosumuptheknowledgeontheonehand,maketheknowledgemorecoherentsystemandregularity,butalsoletthestudentsthemselves,looksupthedeficiencies.So,weteacherstounderstandthestudents'knowledgeofthesituationpriortothereview,studentsnotonlyfoundwidespreaddeficiencies,butalsosomeshortcomings,forthesewelldesignedprograms,reasonablearrangementoftime,thisreviewismoretargetedandmoreeffective.Forexample,youcandesignaformforinvestigation,understandingstudents'weaknessesineachknowledge,putitasareviewofkey,combinedwiththeproblemoftextbookstoreview,bothtoavoidcastinganettihaizhanshu,andimprovetheefficiencyofreview.2,goodcollation.Throughsixyearsofstudy,studentsinthebasics,readingmethod,exercises,andsoalreadyhaveacertaindegreeofaccumulation,thereviewstage,teachersshouldknowhowtoguidethestudentstolabeltheaccumulation,process,formasystemofknowledgenetworks.Exercisesforstudentstoberepresentative,fine,complete,tolive,andearnestlydoaproblemlearningamethod,classofpasswastogettimeefficientreviewresults.3,payattentiontouse.Theaccumulationofknowledgeisultimatelytouse,therefore,reviewthesituationandlifesituationtobecreatedinavarietyoflanguages,guidestudentsonthebasisofthepreviousaccumulationofknowledgetousetothemaximum,andreallyapplywhattheyhavelearned.Second,reviewthecontentandstrategyofthefirstpart:thebasics(a)1,reviewthemainpointsofHanyuPinyinisabletoreciteandwritedownthealphabetofHanyuPinyin;accuratespellingpronunciation(afterreadingcacuminal,nasalsound,light,andretroflexsounds),thecorrectwriteconsonants,vowelsandsyllables.2,.maintypesaccordingtotheorderofthealphabetofHanyuPinyinalphabeticalorder;fillintheappropriateuppercaseandlowercaseletters;seephoneticwritingwords;pinyintowritesentenceswithdottoselectthecorrectpronunciationoftheword;tobringsomeinitialconsonantsorvowels,wordselection.Second,themaintypesofwords(1)Rubywrittenwords;(2)tobringWordtoselectthecorrectpronunciation;(3)useasequencerandradicalcharacterlookupmethod无论是统筹推进“五位一体”总体布局，还是全力推进全面建成小康社会进程，乃至实现“两个一百年”奋斗目标，都需要不忘初心，继续前行。八年级数学测试题一、选择题1．在代数式2x，1()3xy，3x，5ax，)2)(1(3xxx中，分式有（）A、2个B、3个C、4个D、5个2．当a为任何实数时，下列分式中一定有意义的一个是()A．21aaB．11aC．112aaD．112aa3．下列四个命题中，假命题是（）．A、等腰梯形的两条对角线相等B、顺次连结四边形的各边中点所得的四边形是平行四边形C、菱形的对角线平分一组对角D、两条对角线互相垂直且相等的四边形是正方形4．若点（1,1x）、)2,(2x、)1,(3x都在反比例函数xy2的图象上，则321,,xxx的大小关系是（）A．231xxxB．312xxxC．321xxxD．132xxx5．以下列各组数为边长，能构成直角三角形的是().A．2，3，5B．3，2，5C．32，42，52D．1，2，36．某乡镇改造农村电网，需重新架设4000米长的电线.为了减少施工对农户用电造成的影响，施工时每天的工作效率比原计划提高13，结果提前2天完成任务，问实际施工中每天架设多长电线?如果设原计划每天架设x米电线，那么列出的方程是().A．400013xx―4000x=2B．4000x―400013xx=2C．400013x―4000x=2D．4000x―400013x=27．如图1，等腰梯形ABCD中，AD∥BC，AE∥DC，∠B=60º，BC=3，△ABE的周长为6，则等腰梯形的周长是（）。A．8B.10C.12D.16Dothefollowingthreemainpoints:1findouttheweak.Reviewprocessistosumuptheknowledgeontheonehand,maketheknowledgemorecoherentsystemandregularity,butalsoletthestudentsthemselves,looksupthedeficiencies.So,weteacherstounderstandthestudents'knowledgeofthesituationpriortothereview,studentsnotonlyfoundwidespreaddeficiencies,butalsosomeshortcomings,forthesewelldesignedprograms,reasonablearrangementoftime,thisreviewismoretargetedandmoreeffective.Forexample,youcandesignaformforinvestigation,understandingstudents'weaknessesineachknowledge,putitasareviewofkey,combinedwiththeproblemoftextbookstoreview,bothtoavoidcastinganettihaizhanshu,andimprovetheefficiencyofreview.2,goodcollation.Throughsixyearsofstudy,studentsinthebasics,readingmethod,exercises,andsoalreadyhaveacertaindegreeofaccumulation,thereviewstage,teachersshouldknowhowtoguidethestudentstolabeltheaccumulation,process,formasystemofknowledgenetworks.Exercisesforstudentstoberepresentative,fine,complete,tolive,andearnestlydoaproblemlearningamethod,classofpasswastogettimeefficientreviewresults.3,payattentiontouse.Theaccumulationofknowledgeisultimatelytouse,therefore,reviewthesituationandlifesituationtobecreatedinavarietyoflanguages,guidestudentsonthebasisofthepreviousaccumulationofknowledgetousetothemaximum,andreallyapplywhattheyhavelearned.Second,reviewthecontentandstrategyofthefirstpart:thebasics(a)1,reviewthemainpointsofHanyuPinyinisabletoreciteandwritedownthealphabetofHanyuPinyin;accuratespellingpronunciation(afterreadingcacuminal,nasalsound,light,andretroflexsounds),thecorrectwriteconsonants,vowelsandsyllables.2,.maintypesaccordingtotheorderofthealphabetofHanyuPinyinalphabeticalorder;fillintheappropriateuppercaseandlowercaseletters;seephoneticwritingwords;pinyintowritesentenceswithdottoselectthecorrectpronunciationoftheword;tobringsomeinitialconsonantsorvowels,wordselection.Second,themaintypesofwords(1)Rubywrittenwords;(2)tobringWordtoselectthecorrectpronunciation;(3)useasequencerandradicalcharacterlookupmethod无论是统筹推进“五位一体”总体布局，还是全力推进全面建成小康社会进程，乃至实现“两个一百年”奋斗目标，都需要不忘初心，继续前行。28．如图，有一张直角三角形纸片，两直角边AC=6cm，BC=8cm，将△ABC折叠，使点B与点A重合，折痕为DE，则CD等于（）。A、254B、223C、74D、539．对角线互相垂直平分且相等的四边形一定是（）.A.正方形B.菱形C.矩形D.等腰梯形10．已知：如图2,菱形ABCD中,对角线AC与BD相交于点O,OE∥DC交BC于点E,AD=6cm,则OE的长为（）.A.6cmB.4cmC.3cmD.2cm11．下列说法中,错误的是（）A.平行四边形的对角线互相平分B.对角线互相平分的四