📚 Finding a Vector from the Coordinates of Two Points | IB数学：由两点坐标求解向量
Vectors are a cornerstone of the IB Mathematics curriculum, appearing in both Analysis and Approaches (AA) and Applications and Interpretation (AI). Understanding how to find a vector from the coordinates of two points is not just a discrete skill; it is the gateway to solving complex problems involving lines, planes, and motion. In essence, a vector represents a displacement in space, characterized by both a magnitude (length) and a direction.
向量是IB数学课程中的基石内容，出现在分析与方法（AA）和应用与解释（AI）两门课程中。理解如何通过两点的坐标求解向量，不仅仅是一项独立的技能，更是解决涉及直线、平面和运动等复杂问题的关键。本质上，向量表示空间中的一段位移，具有大小（长度）和方向两个特征。
1. Position vs Displacement Vectors | 位置向量与位移向量
er, a displacement vector describes the change in position from one point to another. This is the vector we calculate when we subtract coordinates. It tells us "how far" and "in what direction" to move.
位置向量描述一个点相对于固定原点的位置。例如，点 A(3, 4) 的位置向量为 OA→ = (3, 4)。而位移向量描述的则是一个点到另一个点的位置变化。这就是我们通过坐标相减得到的向量。它告诉我们“移动了多远”以及“朝哪个方向移动”。
2. The Formula for a Vector Between Two Points | 两点间向量的公式
is crucial to maintain the order: the starting point is subtracted from the ending point.
给定两个点 A 和 B，从 A 到 B 的向量记为 AB→，其求法
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