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命题如果l在平面外,v是l的一个方向向量,a,b是平面α内不共线的两个向量,如果v=xa+yb,则l∥α.
Proposition If l is out of the plane, v is a direction vector of l, and a and b are two vectors that are not collinear in plane α. If v=xa+yb, then l∥α.