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在平面向量的解题中经常会应用到一些正确结论,例如,如果若干个向量首尾相连形成一个封闭的图形,那么这些向量的和等于零向量.由向量加法的三角形法则不难得到其证明.
Some correct conclusions are often applied in the solution of plane vectors. For example, if several vectors are connected end to end to form a closed graph, then the sum of these vectors is equal to the zero vector. The triangle rule of vector addition is not difficult to find.