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[第二章平面向量章末复习方案课件人教A必修4
* * 章末复习方案与全优评估 要点整合再现 阶段质量检测 高频考点例析 考点三 考点一 考点二 第二章 平面向量 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. 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. 1.向量的概念 (1)向量是既有大小又有方向的量,用有向线段来表示,有向线段的长度即向量的模(长度),要注意有向线段有起点,而向量是自由移动的. (2)零向量的长度为0,单位向量的长度为1,二者方向都是任意的.相等向量的长度相等,方向相同;相反向量的长度相等,方向相反;平行(共线)向量的方向相同或相反,与长度无关. 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. 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. 5.几个重要结论 (1)三角不等式||a|-|b||≤|a±b|≤|a|+|b|. (2)在平行四边形中,若相邻两边长为a、b,则|a+b|2+|a-b|2=2(|a|2+|b|2). 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. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. [答案] (1)D (2)B Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. [借题发挥] 1.向量的线性运算实质上是向量的加、减法及数乘运算,实现用基底表示向量的目的.在解题过程中要注意结合共线向量定理的应用. 2.向量的坐标运算主要用于共线问题及数量积问题.注意向量的坐标等于有向线段的终点坐标减去起点坐标. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5
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