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向量的数量积不仅在平面向量中占有重要地位,而且可以推广到空间向量(高二下册),进而解决空间的距离和角的问题。向量的数量积的坐标表示
The scalar product of vectors not only occupies an important position in the plane vector, but also can be extended to the space vector (high 2), and then solve the problem of space distance and angle. Coordinate representation of the scalar product of vectors