向量作为工具在高考中占有着举足轻重的地位,而向量的数量积可以说是向量中的重难点,它不仅可以和三角函数结合,而且在解析几何和不等式中也有应用.因此笔者根据自己多年的教学经验,总结了几点向量数量积的常见用法.一、定义公式众所周知,我们把|a||b|cosβ称为向量a与b的数量积,所以自然我们把定义式作为优先考虑的对象.如:已知向量a与b的夹角为30°,|a|=2,|b|=3~(1/3),则向量 Vector as a tool in the college entrance examination occupies a pivotal position, and the number of products can be said vector vector heavy and difficult point, it can not only combine with the trigonometric functions, but also in analytic geometry and inequality are also applied.Therefore, according to my own years Teaching experience, summed up a few commonly used vector quantity product.First, the definition of the formula As we all know, we call | a | | b | cosβ vector a and b of the number of products, so we naturally define the type as a priority object For example, it is known that the angle between vector a and b is 30 °, | a | = 2 and | b | = 3 ~ (1/3)