青岛版五年级数学全上册复习课件(各单元)复习过程.ppt

,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,*,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,*,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,*,青岛版义务教育六年制五年级数学上册,总复习,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,五年级上册目录,第一单元 小数的乘法,第二单元 对称、平移与旋转,第五单元 多边形面积的计算,第四单元 简易方程,第七单元,统计,第六单元,因数与倍数,第三单元 小数的除法,应用题复习,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,第一单元,小数的乘法,返回目录,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,第一单元 小数的乘法,一,.,小数乘法的意义,1.,小数乘法的意义,(,按乘数是整数还是小数划分,),求几个相同加数的和的简便运算,乘数是小数,:,求这个数的十分之几,百分之几,千分之几,是多少,乘数是整数,:,返回目录,返回本单元首页,例,:8.4,15,84,1.5,84,0.15,表示,:15,个,8.4,是多少,表示,:84,的,1.5,倍是多少,表示,:84,的百分之十五是多少,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,小数乘法,积的近似数,小数乘整数,小数乘小数,计算方法：按整数乘法的计算方法进行计算,积的小数数位的确定。（由两个因数的,小数,数位决定）,采用“四舍五入”法,连乘、乘加、乘减,小数连乘的运算顺序：从左到右的顺序,乘加、乘减的运算顺序,无括号：,有括号：,整数乘法运算定律推广到小数：,应用乘法运算定律进行小数乘法简便计算。,先算乘法，再算加减,先算中括号，再算小括号，最后括号外面的。,返回本单元首页,返回目录,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,第一单元 小数的乘法,二,.,小数乘法的计算法则,计算小数乘法，先按照整数乘法的法则算出积，再看因数中一共有几位小数，就从积的右边起数出几位，点上小数点。,1,、小数乘法,(1),判断积中各有几位小数。,23,0.5 27.5,12.03 4,0.25,21.4,0.7 1.84,0.026 3.6,2.5,4,25,100 0.4,2.5,(),75,52,3900 0.075,0.52,（）,1,0.039,返回目录,返回本单元首页,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,6.70.3=?,返回本单元首页,返回目录,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,6.70.3=,2,0 1,6,7,3,6 7,3,2 0 1,先按整数乘法算出积。,一位小数,一位小数,二位小数,看因数中一共有几位小数，就从积的右边起，数出几位点上小数点。,2.01,.,0.,.,返回本单元首页,返回目录,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,0.4830.06=?,返回本单元首页,返回目录,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,0.4830.06=,0,0.,4 8 3,0.,0 6,三位小数,两位小数,五位小数,乘得的积的小数位数不够，要在前面用,0,补足，再点小数点。,0.02898,2 8 9 8,.,0,积的位数不够怎么办？,返回本单元首页,返回目录,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,同学们用你勤奋的铅笔把下面的题,正确的计算出来吧！,3.7 4.6=,0.29 0.07=,6.5 8.4=,17.02,0.0203,54.60,积的末尾是,0,怎么办？,返回本单元首页,返回目录,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,同学们现在你知道计算小数乘小数要注意什么了吗？,同学们你们能一起讨论交流下面几个问题吗？,计算小数乘小数时,先干什么,?,再干什么？,如何确定小数点的位置？,积的小数位数不够怎么办？,积的末尾有,0,怎么办？,按整数乘法算出积,给积点上小数点,看因数中一共有几位小数，就从积的右边起数出几位，点上小数点。,在前面用,0,补足,先点小数点，再把,0,去掉,返回本单元首页,返回目录,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,计算小数乘法，先按照整数乘法的法则算出积，再看因数中一共有几位小数，就从积的右边数出几位，点上小数点。,返回本单元首页,返回目录,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,不计算，判断积的小数部分有几位。,47 0.05,（）,6.9 0.38,（）,4.2 1.8,（）,4.08 0.08,（）,0.9 0.7,（）,6 0.07,（）,返回本单元首页,返回目录,2,位小数,位小数,2,位小数,位小数,2,位小数,2,位小数,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,2.4,3,5,1.5,=,1.2,0.4,0.11,0.35,=,7.2,12,3.6,0.48,0.132,0.42,你发现了吗？,一个数（,0,除外）乘大于,1,的数，积会比这个数（）；一个数（,0,除外）乘小于,1,的数，积会比这个数（）,大,小,分别比较积和第一个因数，你发现了什么？,返回本单元首页,返回目录,它们都大于,1,呢,它们都小于,1,呢,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,积与因数的大小比较（一个数乘一个不为,0,的数时）,一个数（,0,除外）乘,大于,1,的数，积会比这个数,大,；,一个数（,0,除外）乘,小于,1,的数，积会比这个数,小,。,1.61.2 1.6 50.24 5 3.72.1 3.7,01.4 1.4 63.28 6 120.95 12,=,返回本单元首页,返回目录,小于,大于,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,估计下面各题的商是否正确，,说说你的理由,4.48,3.5=12.8(),12.3,1.5=1.845(),13.3,0.95=0.14,（,),7.2,0.64=46.08 (,),返回本单元首页,返回目录,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,近似值,求商的近似值时,要,除到,需要保留的数位的,下一位,然后按照,“,四舍五入法,”,省略尾数,.,、计算钱数时,通常只算到,“,分,”,返回本单元首页,返回目录,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,保留一位小数,保留两位小数,保留三位小数,4014,26.3731,45.538,26.3731=,0.850645161290322580,.,.,45.538=,1.19736842105263157894,.,.,2.9,2.86,4014=,2.85714285714285174,2.857,0.9,0.85,0.851,1.2,1.20,1.197,返回目录,返回本单元首页,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,保留整数,保留两位小数,保留三位小数,3647,16.20.85,16.20.85=,19.0588235,1,0.77,3647=,0.76595744,0.766,19,19.06,19.059,返回目录,返回本单元首页,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,练一练,132.4,5.636.1,4.63.1,0.3820.13,1.553.9,4.24.5,5.417,0.923,1.484,0.050,0.397,0.933,（,得数保留三位小数,）,返回本单元首页,返回目录,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,?,你会算,8.053.7,吗？,2.1756756,商：,像,5.606060,，,2.4666,，,2.1756756,，小数部分从某一位起，一个数字或者几个数字依次不断地重复出现，这样的小数叫做,。,循环小数,小数部分的位数是有限的小数，叫做 。,例如：,11.587,。,小数部分的位数是无限的小数，叫做 。,例如：,3.18181818,有限小数,无限小数,返回本单元首页,返回目录,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,0.625,是（）小数。,循环小数,一个数的小数部分，一个数字或几个数字依次不断的从复出现，这样的小数叫循环小数。,1.9898,是一个（）小数，用,简便记法记作（）循环节是（）。,有限,.,.,1.98,循环,98,返回本单元首页,返回目录,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,记准方法,当商的小数位数是无限的时候，,要通过“”,来求取近似值。,求取商的近似值，计算时要比保留的小数位数 。,四舍五入法,多除一位,返回本单元首页,返回目录,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,做一做,109,5.280.3,3.250.12,27.083,=17.600,1.111,（得数保留三位小数）,881.25,=70.400,返回本单元首页,返回目录,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,比较大小,2.3332.3,0.5858 0.58,4.3334.44,7.677.677,返回本单元首页,返回目录,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,解决问题,:,根据实际情况取值,算式上用原数,答上最值,返回本单元首页,返回目录,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,老师买来,30,米布给舞蹈队做衣服，每套衣服需要用布,2.2,米；同时购买了一些子，,10,元钱,3,双；彩排结束，,205,名同学坐车返校，每辆车最多坐,25,人,（,1,）能做多少套衣服？,（,2,）每双袜子多少元？,（,3,）需要多少辆车？,（去尾法）,（钱币计算时保留两位小数）,（进一法）,返回本单元首页,返回目录,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,7,位同学照合影,按规定定价,12.5,元，洗,4,张照片。由于他们每人要了,1,张照片，共用了,17,元。加洗,1,张照片需要多少元,?,返回本单元首页,返回目录,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,简易方程复习课,第四单元,返回目录,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,简易方程,用字母表示数,1.,表示运算定律 如加法结合律：,2.,表示图形面积,周长计算公式 如,:,a,b,c=(a+b)2,3.,表示数量关系 如,:,用,s,表示路程,v,表示速度,t,表示时间 则,s=vt,4.,表示数量 如,:,用,a,表示小红的岁数,妈妈比小红大,25,岁,则妈妈的岁数可用 来表示,5.,含有字母的式子的简写。,a+a=aa=,解方程,方程的意义,:,含有未知数的等式叫做方程,解方程的依据,:,用方程解应用题,1.,解设,(,一般设所求问题为,x),2.,找出等量关系式,3.,列方程并解答检验,4.,作答,什么是解方程、方程的解。,返回目录,返回本单元首页,a+b=b+a,a+25,2a,a,2,S=ab,等式的性质,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,一、用字母表示数,1,、在含有字母的式子里,数字和字母中间的乘号可记作,“,.,”,但是要注意,应把数字写在字母前面,.,如,:C=4a,5,a x,3 a,1 a,b,=5a,=3x,=a,2,、,a,a,可以写成,(),读作,(),表示,(),4,、,b,2,可以写成,(),表示,(),b,b,可以写成,(),表示,(),6 2.5,2 x,x=,6,2 2.5,2,X+x=,2,a,2,a,的平方,两个,a,相乘,2b,两个,b,相加,b,2,两个,b,相乘,返回目录,返回本单元首页,=,=ab,=36,=12,=6.25,=5,2x,x,2,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,三 用含有字母的式子表示数量。,1,、,c,的,7,倍,2,、,20,减去,a,的,2,倍的差,3,、比,x,的,10,倍多,2.5,4,、有一批货物，运走,b,吨还剩,a,吨，,原来有（）吨。,7c,20-2a,10 x+2.5,a+b,返回目录,返回本单元首页,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,5,、招健买练习本，每本,x,元，共用去,a,元，,买了（）本。,6,、换换今年,a,岁，爷爷的年龄是换换的,x,倍还多,3,岁，爷爷今年（）岁。,7,、黄远亮有笔,48,支，借给同学,b,支，借给,晏老师,c,支，还剩下（）支。,a,x,ax+3,a-b-c,返回目录,返回本单元首页,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,.,方程,:,方程的解,:,解方程,:,含有未知数,的,等式,.,使方程左右两边相等的未知数的,值,.,求方程的解的,过程,.,返回目录,返回本单元首页,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,一,.,我会填,.,1.,小画册每本,a,元,买,b,本应付,(),元,c,元可买,(),本,.,2.,乘法分配律用字母表示是,(),3.,正方形的边长为,a,周长是,(),面积是,().,4.7a,3a+2a,的结果是,(),5.,某校五年级一共有,48,名学生,其中男同学有,a,名,女同学有,(),名,.,6.3,2,=()x,2,=(),7.,电视机厂去年共生产彩色电视机,x,台,平均每月生产电视机,(),台,.,8.,长方形的长是,27,米,宽比长少,a,米,长方形的宽是,(),米,面积是,(),平方米,.,ab,ca,a(b+c)=ac+bc,4a,a,2,6a,48,a,9,xx,x12,27,a,27,(27,a),返回目录,返回本单元首页,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,9.,妈妈买了,4,千克西红柿,每千克,x,元,付了,b,元钱,应找回,(),元,.,10.,爸爸今年,a,岁,比小华大,25,岁,过,x,年后,爸爸比小华大,(),岁,.,二,.,我会算,.,1.,解下列方程,.,17.8+14x=26.2 0.125,5x=0.1,x,0.36x=200.8 3(x,2.1)=10.5,（最后这一个你可以选作）,b,4x,25,返回目录,返回本单元首页,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,2.,列方程解答,.,(1),一个数的,8.1,倍减去,2.1,除,4.2,的商,差是,44.98,求这个数,.,(2),什么数的,3,倍正好是,1.8,的一半,?,(3),乙数比甲数的,3,倍多,0.1,乙数是,5.8,甲数是多少,?,返回目录,返回本单元首页,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,A,、,B,两地相距,320,千米,甲乙两辆汽车同时从,A,、,B,两地开出,相向而行,2.5,小时相遇,.,已知甲车每小时比乙车快,12,千米,求甲车的速度,.,320,千米,甲,乙,三、用方程解应用题,.,返回目录,返回本单元首页,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,多边形的面积,Duo bian xing de mian ji,第五单元,返回目录,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,S=a,2,S=ab,a=s,b,b=sa,a,a,b,长方形的面积,=,长,宽,正方形的面积,=,边长,边长,返回目录,返回本单元首页,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,S=,a=,h=,S=,h=,a=,b=,a,h,a,b,h,a,h,S=,a=,h=,平行四边形的面积,=,三角形的面积,=,梯形的面积,=,返回目录,返回本单元首页,底,高,（上底,+,下底）,高,2,底,高,2,ah,s,h,s,a,ah2,2Sh,2Sa,(a+b)h2,2S(a+b),2Sh-b,2Sh-a,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,图形,底,高,面积,平行四边形,8,米,4.5,米,三角形,1.2,分米,0.8,分米,梯形,上底,3,厘米,下底,5,厘米,2,厘米,36,平,方米,0.48,平,方分米,8,平方,厘米,返回目录,返回本单元首页,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,图形,底,高,面积,平行四边形,4,米,12,平,方米,三角形,8,分米,24,平方分米,梯形,上底,4,厘米,下底,6,厘米,25,平方厘米,3,米,6,分米,5,厘米,返回目录,返回本单元首页,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,一个平行四边形通过（）才能拼成一个,长方形。,割补、平移,旋转、平移,割补、旋转,返回目录,返回本单元首页,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,把两个完全一样的三角形重,叠放置，通过（）才能,拼成一个平行四边形。,割补、平移,旋转、平移,割补、旋转,返回目录,返回本单元首页,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,把两个完全一样的梯形重,叠放置，通过（）才,能拼成一个平行四边形。,割补、平移,旋转、平移,割补、旋转,返回目录,返回本单元首页,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,平方千米,公顷,平方米,平方分米,平方厘米,100,10000,100,100,1000000,面积单位的进率,返回目录,返回本单元首页,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,520,公顷,=,（）平方千米,0.27,平方千米,=,（）公顷,5.2,27,返回目录,返回本单元首页,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,1.8,公顷,=,（）平方千米,1.5,公顷,=,（）平方米,1.15,平方米,=,（）平方分米,=,（）平方厘米,0.018,15000,115,11500,返回目录,返回本单元首页,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,底和高都是,100,米的平行四,边形，占地,1,（）。,平方千米,公顷,平方米,选择：,返回目录,返回本单元首页,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,下图两个平行四边形面积相等。,（）,判断：,返回目录,返回本单元首页,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,下图三个三角形面积相等。,（）,返回目录,返回本单元首页,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,三角形面积是平行四边形,面积的一半。（）,返回目录,返回本单元首页,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,正确的说法：,如果三角形和平行四边形的,底和高都分别相等，那么三,角形面积是平行四边形面积,的一半。,返回目录,返回本单元首页,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,两个面积相等的梯形，形状,是相同的。（）,3,5,4,3,5,4,返回目录,返回本单元首页,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,两个完全一样的梯形可,以拼成一个平行四边形。,（）,3,5,4,3,5,4,返回目录,返回本单元首页,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,两个三角形的高相等，它们,的面积就相等。（）,返回目录,返回本单元首页,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,平行四边形的底越长，它的,面积就越大。（）,底,底,返回目录,返回本单元首页,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,面积相等的两个梯形一定能,拼成一个平行四边形。（）,3,5,4,3,5,4,返回目录,返回本单元首页,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,面积相等的两个三角形，形,状也一定相同。（）,3,3,4,4,返回目录,返回本单元首页,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,填空,一个平行四边形面积是,40,平,方厘米，与它等底等高的三,角形面积是（）平方厘米。,20,返回目录,返回本单元首页,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,一个平行四边形的面积是,16,平方厘米，从这个平行四边,形中剪出一个最大的三角形，,这个三角形的面积是（）,平方厘米。,8,返回目录,返回本单元首页,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,选择题,两个平行四边形面积相等，,它们的底和高（）。,一定相等,不一定相等,一定不相等,B,返回目录,返回本单元首页,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,2,6,3,4,62=12,（平方厘米）,34=12,（平方厘米）,单位：厘米,返回目录,返回本单元首页,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,3,4,2,3,5,2,4,5,2,5,2.4,2,3,2.4,2,4,2.4,2,求直角三角形的面积,5,4,3,2.4,哪些算式正确？（）,返回目录,返回本单元首页,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,一个三角形，高不变，底扩,大,3,倍，面积就扩大（）倍。,3 B 6 C 9,A,原来的面积,122=1,现在的面积,322=3,3,倍,1,2,3,2,返回目录,返回本单元首页,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,因数和倍数,第六单元,返回目录,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,1,、什么是倍数？什么是因数？,2,、说出,24,的因数？,6,的倍数？,3,、按什么标准把自然数分为奇数和偶数？,如果数,a,能被数,b,(b0),整除,a,就叫做,b,的倍数,b,就叫做,a,的因数。,24,的因数有：,1,