向量的几何表示,三角形,平行四边形法则使向量具备形的特征,而向量的坐标表示,坐标运算又让向量具备数的特征。所以,向量融“数”“形”于一体,具有几何形式与代数形式的“双重身份”。我们在研究向量问题或用向量解决数学问题时,如果构造适合问题的图形或建立平面直角坐标系,可以将许多复杂问题简单化,抽象问题直观 The geometric representation of the vector, the triangle, the parallelogram law make the vector possess the shape characteristic, and the coordinate of the vector expresses, the coordinate operation lets the vector possess the characteristic of number again. Therefore, the vector of financial “number ” “form ” in one, with geometric form and algebraic form “double identity ”. When we study vector problems or solve mathematical problems by vectors, we can simplify many complex problems and visualize abstract problems if we construct a suitable problem graph or establish a planar rectangular coordinate system