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我们可利用三角形法则对两个向量进行加减运算,但要是用三角形法则对平面上多个向量做加减运算,就显得太麻烦了．而改用多边形法则就十分方便．
We can use the triangle rule to add or subtract two vectors, but if we use triangle rule to add or subtract multiple vectors on the plane, it would be too much trouble. The use of polygon rules is very convenient.