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1、第27讲建构不等关系的应用性问题()Selectionofcomprehensiveabilityinmathematicsentranceexamination27Applicationproblemsofconstructingunequalrelations100080LiangLiping,AffiliatedMiddleSchoolofRenminUniversityofChina,BeijingQuestiontypepredictionInequalityproblem,appeartofunctiontosh
2、owtheformofappearanee,optimization,solvethiskindofproblem,knowledgeneedsnotonlyinequality(thenatureofinequality,inequality,inequality,etc・)，andofteninvolvethefunction,geometricseries,andotheraspectsofknowledge,comprehensiveness,difficultycanbelargeorsmalLIsthepropo
3、sitionofcollegeentranceexaminationandhotsimulationquestions.AroundSampleselectionExample1.ashoppingmallaftermarketinvestigationandanalysisthat,in2003fromthebeginningofthefirstnmonths,thecumulativedemandforacertainnumberofgoods(10000pieces)approximatelymeetthefollow
4、ingrelations:(1)whatmonthofdemandismorethan13thousandinthisyear?(2)iftheproductissoldinthesamemarketatthebeginningofthemonth,howmanyitemsshouldbeputatleastatthebeginningofthemonthinordertoensurethattheproductisnotoutofstockallyearround?(accuratetopart)Explanation:(
5、I)first,themonthlydemandfornmonths二Dreams,Stax.Then,LOrder,thatis,thesolution:,NdreamsinN*n=5,6Thatis,5,6,twomonthsoftheyear'sdemandismorethan13thousand(II)amonthperprimarydeliveryofgoodsamillion,tomakethegoodsoutofstock,fornmonths,notonlyonthemarketthismonthamilli
6、onitems,thereareafewmonthsbeforetheendoftheunsoldgoods.So,andonlyneed:,LAndstardreamsThatistosay,atleast11112piecesofgoodsshouldbesoldatthebeginningofthemonthtoensurethattheyarenotsoldoutalltheyearroundComment:theactualquestionsshouldpayattentiontoitspracticalsigni
7、ficance・Theminimumvalue,cannotbeused,fourpiecesoffivemethodsinotherwise,either・2.casesofknowna,BandCofthreekindsoffoodofvitaminA,Bcontentandthecostofthefollowingtable,ifa,BandCofthreekindsoffoodeachxkgykgZkg,with100kgofmixedfood,whichcontainsatleast56000unitsand630
8、00unitsofvitaminAvitaminB.mixtureinfoodnailBCVitaminA(unit/kilogram)SixhundredSevenhundredFourhundredVitaminB(unit/kilogram)EighthundredFourhundr
