最新提公因式14ppt课件.ppt

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1、提公因式14知识回顾1、单项式乘以多项式的基本形式。2、多项式除以单项式的运算法则。3、因式分解的概念。知识导入单项式乘以多项式运算的逆过程该怎样进行？知识探究3、提公因式的步骤：34x4-17x3-51x2解：原式=17x2×[(34x4-17x3-51x2)÷17x2]=17x2×(2x2-x-3)=17x2(2x2-x-3)步骤：第一步：确定多项式的公因式。第二步：将多项式除以它的公因式，从而得到多项式的另一个因式。课堂练习练2、把下列各式分解因式（1）8x-72（2）a2b-5ab（3）4m3-

2、6m2（4）a2b-5ab+9b知识探究4、注意事项：1）多项式的第一项系数是负数时，一般要先提负号，目的是使括号内第一项的系数是正，括号内的各项都要变号。2）多项式是几项，提公因式后剩余就是几项。当某一项与公因式相同时，提公因式后就是“1”，不可漏掉。3）公因式要提完、提净。即提出公因式后，剩余的另一个多项式不能再有公因式。4）公因式可以是数、单项式，也可以是多项式。课堂练习练3、把下列各式分解因式1）－a2+ab－ac2）6（m－n）3－12（n－m）23）24x2y-（4xy2+28x3y3）课堂

3、小结1、公因式的概念。2、提公因式的概念。3、提公因式的步骤。4、注意事项。谢谢2014.10.20新视野大学英语读写教程第三版B3U1SectionA课后练习答案Pre-readingactivitiesP21Ithinktherearemainlythreereasonsleadingtomostpeople'sfailuretoachievesuccessintheend.First,theydonothavethepassion.Allthesuccessfulpeoplelovetheirwo

4、rkandtheyhaveastrongpassionforit.Second,mostpeoplearenotclearaboutwhattheywant.Theydonotknowtheexactdestinationthattheywanttoreach,sotheyendupgoingnowhere.Finally,mostpeopledonotfocusonwhattheywant.Theyareonlyfocusingonandthinkingaboutwhattheydonnotwant,

5、butthesuccessfulpeoplethinkabouttheirdreamsandtheirgoalsandhowtheycanachievethemallthetime.2.Inmyopinion,thereareatleastthreestepsapartfromtheonesintroducedinthetalk.First,weshouldlearntoadoptsuitablestrategies,whicharecriticaltomakingyouractionefficient

6、andeffective.Second,weshouldrealizethesignificanceoflearning,whichcanprovideuswithsufficientknowledgeandskillsneededforachievingourgoals.Andfinally,weshouldcreateorfindopportunitiesratherthanwaitforopportunitiestofindus.ScriptIsitreallypossibletoachievea

7、nythingyouwantinyourlife?Theanswerisa“yes”.Aslongasyouarecommittedtoyourgoalsandyouarepassionateaboutyourdreams,youwilleventuallyaccomplishthem.ToAccomplishamazingresultsinyourlife,youhavetobe100percentcommittedandyoumustbewillingtosacrificeyourtimeandef

8、fort.Herearethreestepsthatyoumayfollowtomakeyourdreamscometrue.Step1---MapyourgoalsoutWritedownyourgoalsanddevelopadetailedblue-printofhowyouarenotgoingtoachievethem.Withoutgoals,youarenotgoingtostayfocusedonthedirectionyo