教你一手　　一、矢量加、减运算的图示矢量的加、减运算 ,即矢量的合成与分解是处理物理问题必备的数学方法 .矢量加减依据平行四边形定则 ,也可简化为三角形 (多边形 )法 .其图解方法如图4 1 ,若已知矢量A、B、(如图 4 1 (a) ) ,当求R =A +B ,即作矢量的加法时 ,可将A、B两矢 It teaches you to add, subtract, and subtract vectorial additions and subtractions of vectorial additions and subtractions, that is, the synthesis and decomposition of vectors is an indispensable mathematical method for dealing with physics problems. Vector addition and subtraction is based on the parallelogram rule and can also be simplified as a triangle. (Polygon) method. The graphical method is shown in Fig. 4.1. If the vectors A and B are known (Fig. 4 1 (a)), when R = A + B, which is the addition of the vector, A, B two vectors