八年級上冊數(shù)學(xué)知識點總結(jié)

八年級上冊數(shù)學(xué)知識點總結(jié)1第一章三角形的初步知識復(fù)習(xí)總目1、掌握三角形的角平分線、中線和高線2、理解三角形的兩邊之和大于第三邊的性質(zhì)3、掌握三角形全等的判定方法知識點概要1、三角形的定義:由不在同一直線上的三條線段首尾順次相接組成的圖形叫做三角形.三角形有三條邊，三個內(nèi)角，三個頂點.組成三角形的線段叫做三角形的邊;相鄰兩邊所組成的角叫做三角形的內(nèi)角;相鄰兩邊的公共端點是三角形的頂點，三角形ABC用符號表示為?ABC，三角形ABC的邊AB可用邊AB所對的角C的小寫字母c表示，AC可用b表示，BC可用a表示.注意:(1)三條線段要不在同一直線上，且首尾順次相接;A_(2)三角形是一個封閉的圖形;(3)?ABC是三角形ABC的符號標記，單獨的?沒有意義(2、三角形的分類:(1)按角分類:_BC_直角三象形三角形銳角三角形斜三角形鈍角三角形(2)按邊分類:底邊和腰不相等的等腰三角形等腰三角形三角形等邊三角形不等邊三角形3、三角形的主要線段的定義:(1)三角形的中線三角形中，連結(jié)一個頂點和它對邊中點的線段(A表示法:1.AD是?ABC的BC上的中線.12.BD=DC=BC.2注意:?三角形的中線是線段;BCD?三角形三條中線全在三角形的內(nèi)部;advantages,facingtheYangtzeRiverDelta,PearlRiverDelta,Shandongpeninsula,Beijing-Tianjin-Tangshanarea,targetedinvestmentpromotionseveraltimes.Industry-ledunitandvarioustownstreetsaredevelopingdetailedpromotionplans,thebasisofwhatisspecifictoeachindustry,hasformedakindofscale,needtobringinthekindofprojectseachtownstreethasthekindofresources,whatlocation,focusonthedevelopmentofthekindofindustries.Fourstroketechnologyandscience.DeterminantsoftechnologyistheCounty'seconomicdevelopmentthroughscientificandtechnologicalinnovation,improveproductvalue-addedandimproveeconomiccompetitiveness,istheinevitablewaytoachieveleapfrogdevelopment.Talentisthecitycentercity'sfirstresource,istheprimaryindustrydevelopment,andrevitalizationofthesocialprotection.So,intermsofskills:tocatch...Competitive.Encouragingenterprisestoactivelyundertakescienceandtechnologyprojects,strengtheningresearchcooperation,usingadvancedtechnologytoincreasetheaddedvalueoftheirproductstoensurethatintroductionoftransformingscientificandtechnologicalachievementsduringtheyear......Newresearchenterprises......Home,creatinginnovativeplatforms......Genericclassifier.In:first,wemuststrengthenthecultivationoftalent,effortstoincreasevocationaleducationandtrainingandmeetthebasicdemandofenterprisedevelopment.Thenintroducedanumberofthecountyneededscarceeducation,healthprofessionals,meetsocialdevelopmentneedstoinvestmoreinmachinery,pharmaceuticalmanufacturingresearchanddevelopmentinhighereducation,suchastheintroductionoftalenttomeettheneed.Third,wemustrelyon......Post-doctoralworkstation,......Foodresearchstationplatform,totheXXUniversitytofindexperts?三角形三條中線交于三角形內(nèi)部一點;?中線把三角形分成兩個面積相等的三角形((2)三角形的角平分線A三角形一個內(nèi)角的平分線與它的對邊相交，這個角頂點與交點之間的線段21表示法:1.AD是?ABC的?BAC的平分線.12.?1=?2=?BAC.BCD2注意:?三角形的角平分線是線段;?三角形三條角平分線全在三角形的內(nèi)部;?三角形三條角平分線交于三角形內(nèi)部一點;?用量角器畫三角形的角平分線((3)三角形的高A從三角形的一個頂點向它的對邊所在的直線作垂線，頂點和垂足之間的線段(表示法:1.AD是?ABC的BC上的高線.2.AD?BC于D.3.?ADB=?ADC=90?.BDC注意:?三角形的高是線段;?銳角三角形三條高全在三角形的內(nèi)部，直角三角形有兩條高是邊，鈍角三角形有兩條高在形外;?三角形三條高所在直線交于一點(、三角形的三邊關(guān)系4三角形的任意兩邊之和大于第三邊;任意兩邊之差小于第三邊.注意:(1)三邊關(guān)系的依據(jù)是:兩點之間線段是短;(2)圍成三角形的條件是任意兩邊之和大于第三邊(5、三角形的角與角之間的關(guān)系:(1)三角形三個內(nèi)角的和等于180:;(2)三角形的一個外角等于和它不相鄰的兩個內(nèi)角的和;(3)三角形的一個外角大于任何一個和它不相鄰的內(nèi)角.(4)直角三角形的兩個銳角互余.6、三角形的穩(wěn)定性:三角形的三邊長確定，則三角形的形狀就唯一確定，這叫做三角形的穩(wěn)定性(注意:(1)三角形具有穩(wěn)定性;(2)四邊形沒有穩(wěn)定性.7、全等三角形(1)全等三角形的概念能夠完全重合的兩個三角形叫做全等三角形。。(2)三角形全等的判定advantages,facingtheYangtzeRiverDelta,PearlRiverDelta,Shandongpeninsula,Beijing-Tianjin-Tangshanarea,targetedinvestmentpromotionseveraltimes.Industry-ledunitandvarioustownstreetsaredevelopingdetailedpromotionplans,thebasisofwhatisspecifictoeachindustry,hasformedakindofscale,needtobringinthekindofprojectseachtownstreethasthekindofresources,whatlocation,focusonthedevelopmentofthekindofindustries.Fourstroketechnologyandscience.DeterminantsoftechnologyistheCounty'seconomicdevelopmentthroughscientificandtechnologicalinnovation,improveproductvalue-addedandimproveeconomiccompetitiveness,istheinevitablewaytoachieveleapfrogdevelopment.Talentisthecitycentercity'sfirstresource,istheprimaryindustrydevelopment,andrevitalizationofthesocialprotection.So,intermsofskills:tocatch...Competitive.Encouragingenterprisestoactivelyundertakescienceandtechnologyprojects,strengtheningresearchcooperation,usingadvancedtechnologytoincreasetheaddedvalueoftheirproductstoensurethatintroductionoftransformingscientificandtechnologicalachievementsduringtheyear......Newresearchenterprises......Home,creatinginnovativeplatforms......Genericclassifier.In:first,wemuststrengthenthecultivationoftalent,effortstoincreasevocationaleducationandtrainingandmeetthebasicdemandofenterprisedevelopment.Thenintroducedanumberofthecountyneededscarceeducation,healthprofessionals,meetsocialdevelopmentneedstoinvestmoreinmachinery,pharmaceuticalmanufacturingresearchanddevelopmentinhighereducation,suchastheintroductionoftalenttomeettheneed.Third,wemustrelyon......Post-doctoralworkstation,......Foodresearchstationplatform,totheXXUniversitytofindexperts三角形全等的判定定理:(1)邊角邊定理:有兩邊和它們的夾角對應(yīng)相等的兩個三角形全等(可簡寫成“邊角邊”或“SAS”)(2)角邊角定理:有兩角和它們的夾邊對應(yīng)相等的兩個三角形全等(可簡寫成“角邊角”或“ASA”)(3)邊邊邊定理:有三邊對應(yīng)相等的兩個三角形全等(可簡寫成“邊邊邊”或“SSS”)。直角三角形全等的判定:對于特殊的直角三角形，判定它們?nèi)葧r，還有HL定理(斜邊、直角邊定理):有斜邊和一條直角邊對應(yīng)相等的兩個直角三角形全等(可簡寫成“斜邊、直角邊”或“HL”)(3)全等變換只改變圖形的位置，不改變其形狀大小的圖形變換叫做全等變換。全等變換包括一下三種:(1)平移變換:把圖形沿某條直線平行移動的變換叫做平移變換。(2)對稱變換:將圖形沿某直線翻折180?，這種變換叫做對稱變換。(3)旋轉(zhuǎn)變換:將圖形繞某點旋轉(zhuǎn)一定的角度到另一個位置，這種變換叫做旋轉(zhuǎn)變換。中考規(guī)律盤點及預(yù)測三角形的兩邊之和大于第三邊的性質(zhì)歷年來是經(jīng)?？嫉降奶羁疹}的類型，三角形角度的計算也是考到的填空題的類型，三角形全等的判定是很重要的知識點，在考試中往往會考到。第二章特殊三角形復(fù)習(xí)總目1、掌握等腰三角形的性質(zhì)及判定定理2、了解直角三角形的基本性質(zhì)2、掌握勾股定理的計算方法知識點概要1、圖形的軸對稱性質(zhì):對稱軸垂直平分連接兩個對稱點的線段;成軸對稱的兩個圖形是全等圖形2、等腰三角形的性質(zhì)(1)等腰三角形的性質(zhì)定理及推論:定理:等腰三角形的兩個底角相等(簡稱:等邊對等角)推論1:等腰三角形頂角平分線平分底邊并且垂直于底邊。即等腰三角形的頂角平分線、底邊上的中線、底邊上的高重合。推論2:等邊三角形的各個角都相等，并且每個角都等于60?。3、三角形中的中位線連接三角形兩邊中點的線段叫做三角形的中位線。advantages,facingtheYangtzeRiverDelta,PearlRiverDelta,Shandongpeninsula,Beijing-Tianjin-Tangshanarea,targetedinvestmentpromotionseveraltimes.Industry-ledunitandvarioustownstreetsaredevelopingdetailedpromotionplans,thebasisofwhatisspecifictoeachindustry,hasformedakindofscale,needtobringinthekindofprojectseachtownstreethasthekindofresources,whatlocation,focusonthedevelopmentofthekindofindustries.Fourstroketechnologyandscience.DeterminantsoftechnologyistheCounty'seconomicdevelopmentthroughscientificandtechnologicalinnovation,improveproductvalue-addedandimproveeconomiccompetitiveness,istheinevitablewaytoachieveleapfrogdevelopment.Talentisthecitycentercity'sfirstresource,istheprimaryindustrydevelopment,andrevitalizationofthesocialprotection.So,intermsofskills:tocatch...Competitive.Encouragingenterprisestoactivelyundertakescienceandtechnologyprojects,strengtheningresearchcooperation,usingadvancedtechnologytoincreasetheaddedvalueoftheirproductstoensurethatintroductionoftransformingscientificandtechnologicalachievementsduringtheyear......Newresearchenterprises......Home,creatinginnovativeplatforms......Genericclassifier.In:first,wemuststrengthenthecultivationoftalent,effortstoincreasevocationaleducationandtrainingandmeetthebasicdemandofenterprisedevelopment.Thenintroducedanumberofthecountyneededscarceeducation,healthprofessionals,meetsocialdevelopmentneedstoinvestmoreinmachinery,pharmaceuticalmanufacturingresearchanddevelopmentinhighereducation,suchastheintroductionoftalenttomeettheneed.Third,wemustrelyon......Post-doctoralworkstation,......Foodresearchstationplatform,totheXXUniversitytofindexperts3(1)三角形共有三條中位線，并且它們又重新構(gòu)成一個新的三角形。(2)要會區(qū)別三角形中線與中位線。三角形中位線定理:三角形的中位線平行于第三邊，并且等于它的一半。三角形中位線定理的作用:位置關(guān)系:可以證明兩條直線平行。數(shù)量關(guān)系:可以證明線段的倍分關(guān)系。常用結(jié)論:任一個三角形都有三條中位線，由此有:結(jié)論1:三條中位線組成一個三角形，其周長為原三角形周長的一半。結(jié)論2:三條中位線將原三角形分割成四個全等的三角形。結(jié)論3:三條中位線將原三角形劃分出三個面積相等的平行四邊形。結(jié)論4:三角形一條中線和與它相交的中位線互相平分。結(jié)論5:三角形中任意兩條中位線的夾角與這夾角所對的三角形的頂角相等。4、直角三角形的性質(zhì)(1)直角三角形的兩個銳角互余(2)在直角三角形中，30?角所對的直角邊等于斜邊的一半。(3)直角三角形斜邊上的中線等于斜邊的一半)勾股定理:直角三角形兩直角邊a，b的平方和等于斜邊c的平(4222a，b,c方，即(5)攝影定理在直角三角形中，斜邊上的高線是兩直角邊在斜邊上的攝影的比例中項，每條直角邊是它們在斜邊上的攝影和斜邊的比例中項2?ACB=90?CD,AD,BD2,AC,AD,AB2CD?ABBC,BD,AB(6)常用關(guān)系式,,由三角形面積公式可得:ABCD=ACBC中考規(guī)律盤點及預(yù)測特殊三角形中的等腰三角形與第一章的全等三角形的證明結(jié)合起來這種題型會常出現(xiàn)，等腰三角形的性質(zhì)是基礎(chǔ)知識，必須得掌握并靈活的運用到各類題型中去，這類題型中考也是必考的。第三章一元一次不等式復(fù)習(xí)總目1、理解不等式的三個基本性質(zhì)2、會用不等式的基本性質(zhì)解一元一次不等式并掌握不等式的解題步驟3、會解由兩個一元一次不等式組成的不等式組advantages,facingtheYangtzeRiverDelta,PearlRiverDelta,Shandongpeninsula,Beijing-Tianjin-Tangshanarea,targetedinvestmentpromotionseveraltimes.Industry-ledunitandvarioustownstreetsaredevelopingdetailedpromotionplans,thebasisofwhatisspecifictoeachindustry,hasformedakindofscale,needtobringinthekindofprojectseachtownstreethasthekindofresources,whatlocation,focusonthedevelopmentofthekindofindustries.Fourstroketechnologyandscience.DeterminantsoftechnologyistheCounty'seconomicdevelopmentthroughscientificandtechnologicalinnovation,improveproductvalue-addedandimproveeconomiccompetitiveness,istheinevitablewaytoachieveleapfrogdevelopment.Talentisthecitycentercity'sfirstresource,istheprimaryindustrydevelopment,andrevitalizationofthesocialprotection.So,intermsofskills:tocatch...Competitive.Encouragingenterprisestoactivelyundertakescienceandtechnologyprojects,strengtheningresearchcooperation,usingadvancedtechnologytoincreasetheaddedvalueoftheirproductstoensurethatintroductionoftransformingscientificandtechnologicalachievementsduringtheyear......Newresearchenterprises......Home,creatinginnovativeplatforms......Genericclassifier.In:first,wemuststrengthenthecultivationoftalent,effortstoincreasevocationaleducationandtrainingandmeetthebasicdemandofenterprisedevelopment.Thenintroducedanumberofthecountyneededscarceeducation,healthprofessionals,meetsocialdevelopmentneedstoinvestmoreinmachinery,pharmaceuticalmanufacturingresearchanddevelopmentinhighereducation,suchastheintroductionoftalenttomeettheneed.Third,wemustrelyon......Post-doctoralworkstation,......Foodresearchstationplatform,totheXXUniversitytofindexperts知識點概要一、不等式的概念1、不等式:用不等號表示不等關(guān)系的式子，叫做不等式。2、不等式的解集:對于一個含有未知數(shù)的不等式，任何一個適合這個不等式的未知數(shù)的值，都叫做這個不等式的解。3、對于一個含有未知數(shù)的不等式，它的所有解的集合叫做這個不等式的解的集合，簡稱這個不等式的解集。4、求不等式的解集的過程，叫做解不等式。5、用數(shù)軸表示不等式的方法二、不等式基本性質(zhì)1、不等式兩邊都加上(或減去)同一個數(shù)或同一個整式，不等號的方向不變。2、不等式兩邊都乘以(或除以)同一個正數(shù)，不等號的方向不變。3、不等式兩邊都乘以(或除以)同一個負數(shù)，不等號的方向改變。4、說明:?在一元一次不等式中，不像等式那樣，等號是不變的，是隨著加或乘的運算改變。?如果不等式乘以0，那么不等號改為等號所以在題目中，要求出乘以的數(shù)，那么就要看看題中是否出現(xiàn)一元一次不等式，如果出現(xiàn)了，那么不等式乘以的數(shù)就不等為0，否則不等式不成立;三、一元一次不等式1、一元一次不等式的概念:一般地，不等式中只含有一個未知數(shù)，未知數(shù)的次數(shù)是1，且不等式的兩邊都是整式，這樣的不等式叫做一元一次不等式。2、解一元一次不等式的一般步驟:(1)去分母(2)去括號(3)移項(4)合并同類項(5)將x項的系數(shù)化為1四、一元一次不等式組1、一元一次不等式組的概念:幾個一元一次不等式合在一起，就組成了一個一元一次不等式組。2、幾個一元一次不等式的解集的公共部分，叫做它們所組成的一元一次不等式組的解集。3、求不等式組的解集的過程，叫做解不等式組。4、當任何數(shù)x都不能使不等式同時成立，我們就說這個不等式組無解或其解為空集。5、一元一次不等式組的解法(1)分別求出不等式組中各個不等式的解集(2)利用數(shù)軸求出這些不等式的解集的公共部分，即這個不等式組的解集。6、不等式與不等式組不等式:?用符號〉，=，〈號連接的式子叫不等式。?不等式的兩邊都加上或減去同一個整式，不等號的方向不變。?不等式的兩邊都乘以或者除以一個正數(shù)，不等號方向不變。?不等式的兩邊都乘以或除以同一個負數(shù)，不等號方向相反。7、不等式的解集:advantages,facingtheYangtzeRiverDelta,PearlRiverDelta,Shandongpeninsula,Beijing-Tianjin-Tangshanarea,targetedinvestmentpromotionseveraltimes.Industry-ledunitandvarioustownstreetsaredevelopingdetailedpromotionplans,thebasisofwhatisspecifictoeachindustry,hasformedakindofscale,needtobringinthekindofprojectseachtownstreethasthekindofresources,whatlocation,focusonthedevelopmentofthekindofindustries.Fourstroketechnologyandscience.DeterminantsoftechnologyistheCounty'seconomicdevelopmentthroughscientificandtechnologicalinnovation,improveproductvalue-addedandimproveeconomiccompetitiveness,istheinevitablewaytoachieveleapfrogdevelopment.Talentisthecitycentercity'sfirstresource,istheprimaryindustrydevelopment,andrevitalizationofthesocialprotection.So,intermsofskills:tocatch...Competitive.Encouragingenterprisestoactivelyundertakescienceandtechnologyprojects,strengtheningresearchcooperation,usingadvancedtechnologytoincreasetheaddedvalueoftheirproductstoensurethatintroductionoftransformingscientificandtechnologicalachievementsduringtheyear......Newresearchenterprises......Home,creatinginnovativeplatforms......Genericclassifier.In:first,wemuststrengthenthecultivationoftalent,effortstoincreasevocationaleducationandtrainingandmeetthebasicdemandofenterprisedevelopment.Thenintroducedanumberofthecountyneededscarceeducation,healthprofessionals,meetsocialdevelopmentneedstoinvestmoreinmachinery,pharmaceuticalmanufacturingresearchanddevelopmentinhighereducation,suchastheintroductionoftalenttomeettheneed.Third,wemustrelyon......Post-doctoralworkstation,......Foodresearchstationplatform,totheXXUniversitytofindexperts5?能使不等式成立的未知數(shù)的值，叫做不等式的解。?一個含有未知數(shù)的不等式的所有解，組成這個不等式的解集。?求不等式解集的過程叫做解不等式中考規(guī)律盤點及預(yù)測一元一次不等式(組)的解法及其應(yīng)用，在初中代數(shù)中有比較重要的地位，它是繼一元一次方程、二元一次方程的學(xué)習(xí)之后，又一次數(shù)學(xué)建模思想的學(xué)習(xí)，是培養(yǎng)學(xué)生分析問題和解決問題能力的重要內(nèi)容，在近幾年來的考試中會出現(xiàn)此類型的題目第四章圖形與坐標復(fù)習(xí)總目1、掌握平面直角坐標系的建立和坐標點的描述2、根據(jù)需要建立適當?shù)闹苯亲鴺讼?，并在直角坐標系中畫出圖形3、掌握坐標平面內(nèi)的圖形的軸對稱和平移的變換知識點概要1、平面上物體的位置可以用有序?qū)崝?shù)對來確定。2、在平面內(nèi)確定物體的位置一般需要幾個數(shù)據(jù)?有哪些方法?(1)用有序數(shù)對來確定;(2)用方向和距離(方位)來確定;3、在平面內(nèi)有公共原點而且互相垂直的兩條數(shù)軸，就構(gòu)成了平面直角坐標系。簡稱直角坐標系,坐標系所在的平面就叫做坐標平面4、掌握各象限上及x軸，y軸上點的坐標的特點:第一象限(+，+);第二象限(,，+);第三象限(,，,);第四象限(+，,)5、x軸上的點縱坐標為0，表示為(x，0);y軸上的點橫坐標為0，表示為(0，y)6、(1)關(guān)于x軸對稱的兩點:橫坐標相同，縱坐標互為相反數(shù)。(2)關(guān)于y軸對稱的兩點:縱坐標相同，橫坐標互為相反數(shù)。(3)關(guān)于原點對稱的兩點:橫坐標互為相反數(shù)，縱坐標互為相反數(shù)。7、平移點a(x1,y1)向右、左平移h個單位，則得到的新坐標a’(x1+/-h,y1)點b(x2,y2)向上、下平移g個單位，則得到的新坐標a’(x2,y2+/-g)中考規(guī)律盤點及預(yù)測通過對近幾年各地的中考試題的研究發(fā)現(xiàn)，對有關(guān)圖形的軸對稱、平移、旋轉(zhuǎn)、相似、圖形與坐標等知識點的考查呈發(fā)展趨勢，題型以選擇、填空、作圖、解答等多面孔出現(xiàn)。第五章一次函數(shù)復(fù)習(xí)總目1、能用待定系數(shù)法求一次函數(shù)的解析式2、會根據(jù)一次函數(shù)的圖象解相應(yīng)的問題并會取得函數(shù)解析式的基本方法和步驟advantages,facingtheYangtzeRiverDelta,PearlRiverDelta,Shandongpeninsula,Beijing-Tianjin-Tangshanarea,targetedinvestmentpromotionseveraltimes.Industry-ledunitandvarioustownstreetsaredevelopingdetailedpromotionplans,thebasisofwhatisspecifictoeachindustry,hasformedakindofscale,needtobringinthekindofprojectseachtownstreethasthekindofresources,whatlocation,focusonthedevelopmentofthekindofindustries.Fourstroketechnologyandscience.DeterminantsoftechnologyistheCounty'seconomicdevelopmentthroughscientificandtechnologicalinnovation,improveproductvalue-addedandimproveeconomiccompetitiveness,istheinevitablewaytoachieveleapfrogdevelopment.Talentisthecitycentercity'sfirstresource,istheprimaryindustrydevelopment,andrevitalizationofthesocialprotection.So,intermsofskills:tocatch...Competitive.Encouragingenterprisestoactivelyundertakescienceandtechnologyprojects,strengtheningresearchcooperation,usingadvancedtechnologytoincreasetheaddedvalueoftheirproductstoensurethatintroductionoftransformingscientificandtechnologicalachievementsduringtheyear......Newresearchenterprises......Home,creatinginnovativeplatforms......Genericclassifier.In:first,wemuststrengthenthecultivationoftalent,effortstoincreasevocationaleducationandtrainingandmeetthebasicdemandofenterprisedevelopment.Thenintroducedanumberofthecountyneededscarceeducation,healthprofessionals,meetsocialdevelopmentneedstoinvestmoreinmachinery,pharmaceuticalmanufacturingresearchanddevelopmentinhighereducation,suchastheintroductionoftalenttomeettheneed.Third,wemustrelyon......Post-doctoralworkstation,......Foodresearchstationplatform,totheXXUniversitytofindexperts3、掌握一次函數(shù)的性質(zhì)知識點概要1、一次函數(shù):形如y=kx+b(k?0,k,b為常數(shù))的函數(shù)。注意:(1)k?0,否則自變量x的最高次項的系數(shù)不為1;(2)當b=0時，y=kx，y叫x的正比例函數(shù)。2、圖象:一次函數(shù)的圖象是一條直線，(1)兩個常有的特殊點:與y軸交于(0，b);與x軸交于(-，0)(2)由圖象可以知道，直線y=kx+b與直線y=kx平行，例如直線:y=2x+3與直線y=2x-5都與直線y=2x平行。3、性質(zhì):(1)圖象的位置:(2)增減性k>0時，y隨x增大而增大k<0時，y隨x增大而減小4(求一次函數(shù)解析式的方法求函數(shù)解析式的方法主要有三種(1)由已知函數(shù)推導(dǎo)或推證advantages,facingtheYangtzeRiverDelta,PearlRiverDelta,Shandongpeninsula,Beijing-Tianjin-Tangshanarea,targetedinvestmentpromotionseveraltimes.Industry-ledunitandvarioustownstreetsaredevelopingdetailedpromotionplans,thebasisofwhatisspecifictoeachindustry,hasformedakindofscale,needtobringinthekindofprojectseachtownstreethasthekindofresources,whatlocation,focusonthedevelopmentofthekindofindustries.Fourstroketechnologyandscience.DeterminantsoftechnologyistheCounty'seconomicdevelopmentthroughscientificandtechnologicalinnovation,improveproductvalue-addedandimproveeconomiccompetitiveness,istheinevitablewaytoachieveleapfrogdevelopment.Talentisthecitycentercity'sfirstresource,istheprimaryindustrydevelopment,andrevitalizationofthesocialprotection.So,intermsofskills:tocatch...Competitive.Encouragingenterprisestoactivelyundertakescienceandtechnologyprojects,strengtheningresearchcooperation,usingadvancedtechnologytoincreasetheaddedvalueoftheirproductstoensurethatintroductionoftransformingscientificandtechnologicalachievementsduringtheyear......Newresearchenterprises......Home,creatinginnovativeplatforms......Genericclassifier.In:first,wemuststrengthenthecultivationoftalent,effortstoincreasevocationaleducationandtrainingandmeetthebasicdemandofenterprisedevelopment.Thenintroducedanumberofthecountyneededscarceeducation,healthprofessionals,meetsocialdevelopmentneedstoinvestmoreinmachinery,pharmaceuticalmanufacturingresearchanddevelopmentinhighereducation,suchastheintroductionoftalenttomeettheneed.Third,wemustrelyon......Post-doctoralworkstation,......Foodresearchstationplatform,totheXXUniversitytofindexperts7(2)由實際問題列出二元方程，再轉(zhuǎn)化為函數(shù)解析式，此類題一般在沒有寫出函數(shù)解析式前無法(或不易)判斷兩個變量之間具有什么樣的函數(shù)關(guān)系。(3)用待定系數(shù)法求函數(shù)解析式?！按ㄏ禂?shù)法”的基本思想就是方程思想，就是把具有某種確定形式的數(shù)學(xué)問題，通過引入一些待定的系數(shù)，轉(zhuǎn)化為方程(組)來解決，題目的已知恒等式中含有幾個等待確定的系數(shù)，一般就需列出幾個含有待定系數(shù)的方程，本單元構(gòu)造方程一般有下列幾種情況:?利用一次函數(shù)的定義構(gòu)造方程組。?利用一次函數(shù)y=kx+b中常數(shù)項b恰為函數(shù)圖象與y軸交點的縱坐標，