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1、科学家把水结冰的温度定为0。 读作：0摄氏度。 Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.表示摄氏温度表示摄氏温度, , 读作读作“ “摄氏度摄氏度” ”。 表示华氏温度，表示华氏温
2、度， 读作读作“ “华氏度华氏度” ”。 我国用摄氏度我国用摄氏度 来计量温度。来计量温度。 Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.零上温度零上温度 零下温度零下温度 Evalu
3、ation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.一大格表示一大格表示 1010摄氏度。摄氏度。 一小格表示一小格表示 2 2摄氏度。摄氏度。 Evaluation only.Evaluation o
4、nly. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.零上零上4 4摄氏度记作：摄氏度记作：+4 +4 零下零下4 4摄氏度记作：摄氏度记作：-4-4。“ “+4+4” ”读作正四，是一个读作正四，是一个正数正数，+4 +4也可以写作也可以写作4 4
5、；“ “-4-4” ”读作负四，是一个读作负四，是一个负数负数。Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.珠穆朗玛峰大约比海平面高8844.43 米，吐鲁番盆地大约比海平面低155米
6、。海平面珠穆朗玛峰吐鲁番盆地比海平面高8844.43米比海平面低155米记作+ 8844.43米记作-155米高度看作0.Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.比海平面高比海平面
7、高88448844米，通常米，通常 称为海拔称为海拔88448844米，可以记作米，可以记作 +8844+8844米。米。比海平面低比海平面低155155米，通常称米，通常称 为海拔负为海拔负155155米，记作米，记作-155-155米。米。Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-201
8、1 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.像像+4+4、1919、+8844+8844这样的这样的 数都是数都是正数。正数。像像-4-4、-11-11、-155-155这样的这样的 数都是数都是负数。负数。Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyri
9、ght 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.0 0既不是正数，也不是负数。既不是正数，也不是负数。正数都大于正数都大于0 0，负数都小于，负数都小于0 0。Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011
10、Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.议一议：观察这些数，可以怎样分类？-10 15 -155 8844.43 0 +12.5 -3.5353Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Cop
11、yright 2004-2011 Aspose Pty Ltd.原来平行四边形的底原来平行四边形的高（长方形的长）（长方形的宽）Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.长方形的面积
12、 = 长 宽平行四边形的面积 =高原来平行四边形的底原来平行四边形的高（长方形的长）（长方形的宽）底Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.三角形的面积= 2S=ah2平形四边形积
13、底 高底高Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.每个梯形的面积是拼成的每个梯形的面积是拼成的 平行四边形面积的平行四边形面积的一半一半。下底下底上底上底高高 Evaluation
14、 only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.平行四边形的面积平行四边形的面积= =底底 高高上底下底上底下底梯形的面积梯形的面积（上底（上底+ +下底）下底） 高高22梯形面积是平行四边形面积的一半梯形面
15、积是平行四边形面积的一半 Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.梯形的面积梯形的面积= =（上底（上底+ +下底）下底） 高高22如果用如果用S S表示梯形的面积，用表示梯形的面
16、积，用 a a、b b和和h h分别表示梯形的上底、分别表示梯形的上底、 下底和高，上面的公式可以写成下底和高，上面的公式可以写成S=S= (a+b)h 2Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.
