高考数学一轮复习第五章平面向量第3节平面向量的数量积市赛课公开课一等奖省名师优质课获奖课件.pptx

1/72,2/72,3/72,非零,0,180,180,4/72,90,a,b,5/72,|,a,|,|,b,|,cos,0,投影,|,b,|cos,乘积,6/72,|,a,|cos,a,，,e,a,b,0,a,b,|,a,|,2,7/72,b,a,a,c,b,c,(,a,),b,a,(,b,),8/72,a,1,b,1,a,2,b,2,a,1,b,1,a,2,b,2,0,9/72,10/72,11/72,12/72,13/72,14/72,15/72,16/72,17/72,18/72,19/72,20/72,21/72,22/72,23/72,24/72,25/72,26/72,27/72,28/72,29/72,30/72,31/72,32/72,33/72,34/72,35/72,36/72,37/72,38/72,39/72,40/72,41/72,42/72,43/72,44/72,45/72,46/72,47/72,48/72,49/72,50/72,51/72,52/72,53/72,54/72,方法技巧,1.计算数量积三种方法：定义、坐标运算、数量积几何意义，要灵活选取，和图形相关不要忽略数量积几何意义应用,2求向量模惯用方法：利用公式|a|2a2，将模运算转化为向量数量积运算,3利用向量垂直或平行条件结构方程或函数是求参数或最值问题惯用方法与技巧.,55/72,易错点睛,在求ABC三边所对应向量夹角时，要注意是三角形内角还是外角.,56/72,57/72,58/72,59/72,60/72,61/72,62/72,63/72,64/72,65/72,66/72,67/72,68/72,69/72,70/72,71/72,72/72,