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1、七年级第一学期期中考试数学试卷（时间：90分钟满分：100分）题序一二三总分得分一．填空题（2′×10=30′）1．减去的平方的差__________．2．若一个矩形的长为厘米，宽为厘米，则矩形的周长为_____厘米．3．如图所示，阴影部分是由边长为的正方形挖去圆心角为90°，半径为的扇形，则阴影部分的面积_____________．4．与____（填是或不是）同类项.5.（_______）．6.计算：_______．7.计算:__________．8.多项式：是____次____项式．9．利用平方差公式计算：=____________．10.分解因式：__
2、____．11.多项式：4x(x-y)-3(x-y)的公因式是__________．12.计算：（x-3）(x+4)=__________．13.如果是完全平方式，则的值是_________．14.计算：=___________.15．观察下列规律：，；，；，；，；．．．．．．，；．．．．．．onthesleepers,checkedbyqualifiedfitters.4.1.12.2.3afterwindingupthefueltankoftheironcore,shouldbecheckedimmediatelyandhavesomeonerecord
3、ingtheinspectionresultsoftheproject,isolatedintheentireworkarea,onlyauthorizedpeoplecanaccess.4.1.12.2.4checkcontentcheckironcoreandnoironandotherferromagneticmaterialsinthetanktocheckthereisnoattachmentontheironcoreofironandothermetal,tightenallclampboltsontheironcore,inordertored
4、ucethemagneticresistance,noise.Tightentheclampingscrewsonthewinding,tomakethewindingaxialcompressionlevelareconsistent,thenwithamagnetandothertoolschecktankfornuts,boltsandironslagandothermagneticmaterials.Checkandadjustvoltagetapswitch(voltageswitchingdevice),checkthatthevoltagesw
5、itchequipmentoftherotatingdeviceisflexible,andgoodlubrication,mechanicalinterlocksandthelimitswitchshouldcorrect;checktheprimaryandsecondarycontactsisgood,feelergaugescheck(ifpossible).Forelectric-drivenswitchdeviceshouldturnoncontrolpowerinordertocheckifthetapswitchandindicatorisr
6、eliable,indicatoriscorrect.Checkironcorewearheartboltandtheupperandlowergroundingtabletsfirstcheckironcoreupperandlowergroundingtabletswhethercontactgood,hasnorustloosephenomenonexists,thenwith2.5KvtrillionEuropetabledetectionironcorebolt,ontoofinsulationresistance,orto1KVExchangev
7、oltageor2.5KVDCvoltageforcontinued1minofresistancepressuretest,requirementswearheartboltminimuminsulationresistancenotislessthan5ω,asnotmeetrequirementsshouldremovewearheartboltcheck,andforinsulationprocessing.Corewindingcranetankchecked,qualifyingtransformeroilflushingofthebody,ha
8、ngingcorewindingback第7页共7页
