七年级数学上册实际问题与一元一交方程中销售问题人教版.pptx

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,#,3.4,实际问题与一元一次方程,销售问题,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,购物广场,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,大亏本,大放血,5,折酬宾,清仓处理,跳楼价,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,跳楼价,清仓处理,满,200,返,160,5,折酬宾,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,知识探究,探究销售中的盈亏问题,:,1,、商品原价,200,元，九折出售，卖价是,元,.,2,、商品进价是,30,元，售价是,50,元，则利润,是,元,.,3,、某商品原来每件零售价是,a,元,现在每件降价,10%,降价后每件零售价是,元,.,4,、某种品牌的彩电降价,20%,以后，每台售价为,a,元，则该品牌彩电每台原价应为,元,.,5,、某商品按定价的八折出售，售价是,14.8,元，则原定售价是,.,0.9a,1.25a,18.5,元,180,20,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,知识探究 课前热身,我思,我进步,1,探究销售中的盈亏问题,:,1,、商品原价,200,元，九折出售，卖价是,元,.,2,、商品进价是,150,元，售价是,180,元，则利润,是,元,.,利润率是,_,3,、某商品原来每件零售价是,a,元,现在每件降价,10%,降价后每件零售价是,元,.,4,、某种品牌的彩电降价,20%,以后，每台售价为,a,元，则该品牌彩电每台原价应为,元,.,5,、某商品按定价的八折出售，售价是,14.8,元，则原定售价是,.,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,思考？,对上面商品销售中的盈亏问题里有哪些量,?,成本价,(,进价,),标价,;,销售价,;,利润,;,盈利,;,亏损,:,利润率,对上面这些量有何关系,?,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,=,商品售价,商品进价,售价、进价、利润的关系式：,商品,利润,进价、利润、利润率的关系,：,利润率,=,商品进价,商品利润,100%,标价、折扣数、商品售价关系,:,商品售价,标价,折扣数,10,商品售价、进价、利润率的关系：,商品进价,商品售价,=,(1+,利润率,),销,售,中,的,盈,亏,驶向胜利的彼岸,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,练习：,6,、一件衣服售价,60,元，卖出后亏损,25%,，求出它的进价？,5,、一件衣服售价,60,元，卖出后可盈利,25%,，求出它的进价？,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,猜一猜,“,衣衣不舍”时装店，老板以,60,元的同样价格卖了两件衣服，其中甲件盈利,25%,，乙件亏损,25%.,商家在这次买卖是盈了或是亏了,还是不盈不亏,?,探究一：,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,某商店在某一时间以每件,60,元的价格卖出两件衣服,其中一件盈利,25,，另一件亏损,25,，卖这两件衣服总的是盈利还是亏损，或是不盈不亏,?,￥,60,￥,60,想一想,:,1.,这一问题情境中有哪些已知,量,?,哪些未知量,?,如何设未知,数,?,相等关系是什么？,2.,如何判断是盈是亏？,探索乐园,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,说一说,盈或亏跟什么有关系,？,售价,与,进价,当,售价,大于,进价,时,盈利,当,售价,小于,进价,时,亏损,当,售价,等于,进价,时,不盈不亏,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,因为,总进价,大于,总售价,算一算,售价 进价,甲,60,x,利润,0.25,x,解,:,设甲件衣服的进价为,x,元,根据题意可列方程,x+0.25x=60,解得,x=48,乙,60,y,-0.25y,乙件衣服的进价为,y,元,y-0.25y=60,y=80,总进价为,x+y=,总售价为,120,128,所以,亏了,8,元,.,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,（,2,）,某文具店有两个进价不同的计算器都卖,64,元，其中一个盈利,60%,，另一个亏本,20%.,这次交易中的盈亏情况？,解：设盈利,60%,的那个计算器进价为,X,元，它的利润是,0.6X,元，则,X+0.6X=64,得,X=40,设亏本,20%,的那个计算器进价为,Y,元，它的利润是,-0.2Y,元，则,Y+(,0.2Y)=64,得,Y=80,所以两个计算器进价为,120,元，而售价,128,元，进价小于售价，因此两个计算器总的盈利情况为盈利,8,元,.,请再做一做,:,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,4.,假如你是经理，以,60,元的同样价格卖了两件衣服，其中甲件盈,25%,，乙件亏损,15%.,商家在这次买卖是盈了或是亏了,还是不盈不亏,?,我来当老板,我来当老板,我来当经理,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,=,商品售价,商品进价,售价、进价、利润的关系式：,商品,利润,进价、利润、利润率的关系,：,利润率,=,商品进价,商品利润,100%,标价、折扣数、商品售价关系,:,商品售价,标价,折扣数,10,商品售价、进价、利润率的关系：,商品进价,商品售价,=,(1+,利润率,),销,售,中,的,盈,亏,驶向胜利的彼岸,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,谢谢,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,点滴收获,实际问题,数学问题的解,实际问题,的答案,数学问题,（一元一次方程）,设未知数，列方程,解方程,检验,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,布置作业,P,108.3.4,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,