Equation and curves——theorem of halved-equation(Type A_3)

When a formula for general term of halved-equation (Type A 3)is applied to an arbitrary positive integer n,a general equation of unary nth algebraic expression,with complex coefficients,can be obtained.Each general equation produces a concrete given equation,according to any point in an coordinate plane.Then n complex roots can be got accurately and easily through its necessary root extracting formula.Equation and extraction of root resulting from the theorem are indefinite,because of the indefinitness of n.