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1、people-oriented,natureistoputtheaccumulationofattentionfromtheone-sidedpursuitofmaterialqualitygrowthandwealth.Graduallytransfertopromotetheall-rounddevelopmentofpeopleup.Changesinworkstyleofcadres,strengthentheconstructionofadministrativeefficiencyfororgans,alsopracticepracticeoftheimport
2、antthoughtof"ThreeRepresents",andtheinevitablerequestofstrengtheningtheparty'sgovernancecapabilityandadvancedintothebuilding,isfullyimplementtheconstructionofScientificOutlookonDevelopment,tobuildaharmonioussocietyTheneedofreality.Throughthisactivity,the中考复习之函数的综合运用知识考点:会综合运用函数、方程、几何等知识解决与
3、函数有关的综合题以及函数应用问题。精典例题:【例1】如图,一次函数的图像经过第一、二、三象限,且与反比例函数的图像交于A、B两点,与轴交于C点,与轴交于D点,OB=,tan∠DOB=。(1)求反比例函数的解析式;(2)设点A的横坐标为,△ABO的面积为,求与之间的函数关系式;并写出自变量的取值范围。(3)当△OCD的面积等于时,试判断过A、B两点的抛物线在轴上截得的线段长能否等于3?如果能,求出此时抛物线的解析式;如果不能,请说明理由。解析:(1)(2)A(,),直线AB:,D(,0)易得:,()(3)由有,解得,(舍去)∴A(1,3),过A、B两点的抛物线的解析式为,设抛
4、物线与轴两交点的横坐标为、,则,若有整理得,由于△=-12<0方程无实根故过A、B两点的抛物线在轴上截得的线段长不能等于3。评注:解此题要善于利用反比例函数、一次函数、二次函数以及三角形面积等知识,并注意挖掘问题中的隐含条件。【例2】某商店经销一种销售成本为每千克40元的水产品,据市场分析,若按每千克50元销售,一个月能售出500千克;销售单价每涨1元,月销售量就减少10千克,针对这种水产品的销售情况,请解答以下问题:(1)当销售单价定为每千克55元时,计算月销售量和月销售利润;(2)设销售单价为每千克元,月销售利润为元,求与之间的函数关系式(不必写出自变量的取值范围);(
5、3)商店想在月销售成本不超过10000元的情况下,使得月销售利润达到8000元,销售单价应定为多少?(4)商店要想月销售利润最大,销售单价应定为多少元?最大月销售利润是多少?解析:(1)(元)(2)learning,findtheproblemseriously.Inthestudy,whethertheorganization'sstaffwillbehard,fromitsstart,doalittlebitoftheirownefforts.Theforcebecomecadresofqualified,tomakeitbecomeanefficient,low-co
6、stpeople-oriented,natureistoputtheaccumulationofattentionfromtheone-sidedpursuitofmaterialqualitygrowthandwealth.Graduallytransfertopromotetheall-rounddevelopmentofpeopleup.Changesinworkstyleofcadres,strengthentheconstructionofadministrativeefficiencyfororgans,alsopracticepracticeoftheimpo
7、rtantthoughtof"ThreeRepresents",andtheinevitablerequestofstrengtheningtheparty'sgovernancecapabilityandadvancedintothebuilding,isfullyimplementtheconstructionofScientificOutlookonDevelopment,tobuildaharmonioussocietyTheneedofreality.Throughthisactivity,the(3)当