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在平面中有平面向量基本定理:如果e1,e2是同一平面内两个不共线的向量,那么,对于这一平面内的任一向量a,有且只有一对实数λ1,λ2,使
There is a plane vector in the plane. The basic theorem: if e1 and e2 are two non-collinear vectors in the same plane, then for any vector a in this plane, there is only one pair of real numbers λ1 and λ2