最新方程根的分布教学讲义ppt课件.ppt

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1、方程根的分布例1、已知a<0，函数f(x)=-x2-ax+b在闭区间[-1,1]上的最大值为1，最小值为-1，求实数a、b3、二次函数闭区间上的最值问题4、二次方程根的分布问题（实根分布）Day11.sharev.分享、合用：sharesthwithsbn.一份，股份2.sparea.业余的，备用的：sparetime,业余时间；asparetire备胎v.抽出，匀给：sparemefiveminutes/spareoneofsandwichesfortheboy,sparenoefforts：不遗余力sparenoexpense：不惜工本3.s

2、avev.节省，救出20week-05积土成山聚溪成渊Day24.argue～withsbabout/oversth：和某人就某事争论～for/againststh：赞成/反对～Sbinto/outof(doing)sth：说服某人做/不做某事5.have/make+宾+宾补(do/doing/done)havehimshowyouaround.makehimselfheard/understood6.getsbtodosth让某人做某事getsthdone使某事被做getpaid/dressed/done21week-05积土成山聚溪成渊Day

3、37.equalbeequaltosth：与…相等beequalto(doing)sth：胜任(做)某事equalsth：与…相等equalsbinsth：在…方面与某人匹敌8.comparecompare…to/with…把…比作/相比comparedto/with…作状语ComparedwithBJ,SHiswarmerinwinter.22week-05积土成山聚溪成渊Day49.consider(以为，认为)～sb./sth.+adj/nWeconsiderhimhonest/afriend～sb./sth.+todo常见被动结构sb/s

4、thbeconsideredtodo～sb./sth.+as把…当作…～that-clause10.consider(考虑)～n.～doing考虑去做某事～+疑问词+todosth“把…当作…”的译法：consider…as=thinkof/lookon/take/regard/treat/have…as23week-05积土成山聚溪成渊Day5thefirsttimeThefirsttime+从句Hefellinlovewiththecountrythefirsttimehesetfootonit.Forthefirsttime：作时间状语Fo

5、rthefirsttime,IrealizedtheimportanceofEnglish.It’sthefirsttime+that-clause(完成时)It’sthefirsttimeIhavebeenhere.thefirst+名词+todoHeisthefirsttocome,thelasttoleave.24week-05积土成山聚溪成渊Day6主+be+adj.+todo=Itbe+adj.+(for/ofsb)+todosth不定式一般用主动式，与主语存在逻辑上的动宾关系，所以当不定式的动词是不及物动词时，则应在其后加上适当的介词

6、。for/ofsb常常省去eg.Thisquestionisdifficulttoanswer.=It’sdifficulttoanswerthequestion.Themanishardtoworkwith.=It’shardtoworkwiththeman.当不定式用作定语时，与其所修饰的词之间存在逻辑上的动宾关系，且主语为该动作的执行者时，也常常用主动形式。Eg.Hewantswatertodrink.Shehasaroomtolivein.IwillgotoBeijingtomorrow.Doyouhaveanythingtobetake

7、nthere?25week-05积土成山聚溪成渊