北师大七年级数学下册第一章复习

地形平坦开阔，地层由第四系全新冲积层，第四系上更新统冲层组成，局部表覆第四系全新统人工堆积层。第四系全新统冲积层厚度约25～50m，岩性主要为黏土、粉质黏土、粉土、粉砂、细砂；第四系上更新统冲积层厚度大于50m，岩性主要为黏性土、粉土、粉细砂等。管桩深度范围内地层主要为：粉土、黏土、粉质黏土，局部表层为杂填土。couplingCentreshallbechecked,thesecondpouredconcretestrengthofmorethan70%.Intheprocessofreamingorboring,apartfromthespecialprovisionsinfactory,doesnotallowanyworkthatmayaffectthecouplingCentre,suchasirrigation,tocylinderconnectionstofloodthecondenserpipesandsoon.Wellboring,hingeboltholeflangewithcouplingofvertical,notoblique.Mountingboltsshouldbeaddedlubricants,typinggentlywithasmallhammer,nottoolooseortootight,packedtheboltswiththecorrespondingsealscrewholeshouldbemarked.6.4.5.4.2couplingreamedandpairingsisclosetothediameterofboltbearinggoodhingeholes,dressedwithagoodtwocouplingboltsbeforeyoucanmovetherotor,boring-reamingholeinturn.Couplingboltsmustbetightcouplingissymmetricaldiameter,inboring,reaming,twoboltsout.Wellboring,hingeboltholeflangewithcouplingofvertical,notoblique.Duetothecouplingboltsinaccordancewithhingeholescorrespondingtothediameterofthescrewholesonebyoneafterprocessing,processingbackboltinstallationlocationcannotbechanged,soaccordingtoboltaftertheactualweightdifferenceofnutandlockwashertomatch.Generalrequirementsforcouplingtwosymmetricaldiameterbolt,nutandlockwasher'stotalweightdifferenceshouldnotbegreaterthan10gandknocksstampedmark.(SeeFigure18)Thecouplingboltsapplylubricant,andthengentlywithcopperhome,nottoolooseortootight.BoltAssemblyisfinished,symmetricaltighteningallboltsto30%,50%,70%,100%force,andcheckthecouplingflutterandbeforeconnectingthecirclegraduallychangesitsvalueshouldbelessthan0.02mm.Tighteningtorqueofthecouplingboltsshallcomplywiththetechnicalrequirementsmanufacturersdrawings,withadynamometricwrenchorlogtensiontools.Threewheelrotorswingtestcouplingconnectionsshouldbechecked:takingleave,华达瑞英教育个性化教学辅导教案学科：数学任课教师：季烨授课时间：2015年4月11日(星期六)姓名梁懿年级七年级性别男学校河实总课时36第1课教学目标1.梳理本章内容，重点加强对整式乘除，平方差公式和完全平方公式应用的复习，并能灵活利用知识解决问题。2.了理解幂的乘方与积的乘方的概念。3.了解同底数幂的除法的运算性质，理解零指数幂和负整指数幂的意义。难点重点重难点重点：整式乘除法的概念，平方差公式和完全平方公式的应用。难点:平方差公式和完全平方公式的互逆。课堂教学过程课前检查作业完成情况：优□良□中□差□建议__________________________________________过程【错题再练】【温故知新】【复习讲授】知识点一同底数幂的乘法、除法同底数幂相乘，底数不变，指数相加同底数幂相除，底数不变，指数相减例题计算：（1）10²·105（2）23()()()abcbcacab（3）（1）（m-1）5÷（m-1）3（4）（x-y）10÷（y-x）5÷（x-y）；【课堂同步检测】1.已知24,27,2abab求的值2.（-a2）5÷（-a）3=，920÷2710÷37=。地形平坦开阔，地层由第四系全新冲积层，第四系上更新统冲层组成，局部表覆第四系全新统人工堆积层。第四系全新统冲积层厚度约25～50m，岩性主要为黏土、粉质黏土、粉土、粉砂、细砂；第四系上更新统冲积层厚度大于50m，岩性主要为黏性土、粉土、粉细砂等。管桩深度范围内地层主要为：粉土、黏土、粉质黏土，局部表层为杂填土。couplingCentreshallbechecked,thesecondpouredconcretestrengthofmorethan70%.Intheprocessofreamingorboring,apartfromthespecialprovisionsinfactory,doesnotallowanyworkthatmayaffectthecouplingCentre,suchasirrigation,tocylinderconnectionstofloodthecondenserpipesandsoon.Wellboring,hingeboltholeflangewithcouplingofvertical,notoblique.Mountingboltsshouldbeaddedlubricants,typinggentlywithasmallhammer,nottoolooseortootight,packedtheboltswiththecorrespondingsealscrewholeshouldbemarked.6.4.5.4.2couplingreamedandpairingsisclosetothediameterofboltbearinggoodhingeholes,dressedwithagoodtwocouplingboltsbeforeyoucanmovetherotor,boring-reamingholeinturn.Couplingboltsmustbetightcouplingissymmetricaldiameter,inboring,reaming,twoboltsout.Wellboring,hingeboltholeflangewithcouplingofvertical,notoblique.Duetothecouplingboltsinaccordancewithhingeholescorrespondingtothediameterofthescrewholesonebyoneafterprocessing,processingbackboltinstallationlocationcannotbechanged,soaccordingtoboltaftertheactualweightdifferenceofnutandlockwashertomatch.Generalrequirementsforcouplingtwosymmetricaldiameterbolt,nutandlockwasher'stotalweightdifferenceshouldnotbegreaterthan10gandknocksstampedmark.(SeeFigure18)Thecouplingboltsapplylubricant,andthengentlywithcopperhome,nottoolooseortootight.BoltAssemblyisfinished,symmetricaltighteningallboltsto30%,50%,70%,100%force,andcheckthecouplingflutterandbeforeconnectingthecirclegraduallychangesitsvalueshouldbelessthan0.02mm.Tighteningtorqueofthecouplingboltsshallcomplywiththetechnicalrequirementsmanufacturersdrawings,withadynamometricwrenchorlogtensiontools.Threewheelrotorswingtestcouplingconnectionsshouldbechecked:takingleave,3..如果am÷ax=am3，那么x等于（）A．3B.-2mC.2mD.-3【课堂作业检测】的值求（已知m201122)2,1602mm一颗人造地球卫星的速度是2.88×107m/h，一架喷气式飞机的速度是1.8×106m/h，这颗人造地球卫星的速度是这架喷气式飞机的速度的多少倍？化简求值：（2x-y）13÷[（2x-y）3]2÷[（y-2x）2]3，其中x=2，y=-1。【知识小结】知识点二幂的乘法与积的乘法1.幂的乘方，底数不变，指数相乘2.积的乘方等于乘方的积。例题（1）（－x5）2=_______，（2）（－x2）5=________（3）2233yx=_______，（4）2323xyyx=________【课堂同步练习】（1）已知164=28m，则m=________（2）已知x3+y4－5=0，求8x×16y的值．（3）判断题，错误的予以改正。1.a5+a5=2a10（）2.（s3）3=x6（）3.x3+y3=（x+y）3（）4.（－3）2·（－3）4=（－3）6=－36（）5.[（m－n）3]4－[（m－n）2]6=0（）【课堂作业检测】地形平坦开阔，地层由第四系全新冲积层，第四系上更新统冲层组成，局部表覆第四系全新统人工堆积层。第四系全新统冲积层厚度约25～50m，岩性主要为黏土、粉质黏土、粉土、粉砂、细砂；第四系上更新统冲积层厚度大于50m，岩性主要为黏性土、粉土、粉细砂等。管桩深度范围内地层主要为：粉土、黏土、粉质黏土，局部表层为杂填土。couplingCentreshallbechecked,thesecondpouredconcretestrengthofmorethan70%.Intheprocessofreamingorboring,apartfromthespecialprovisionsinfactory,doesnotallowanyworkthatmayaffectthecouplingCentre,suchasirrigation,tocylinderconnectionsto