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系数为实数的一元二次方程x2+bx+c=0是大家所熟悉的,如果将方程中的未知量x改为未知向量x(本文中的向量指平面向量),而将常数b改为常向量b,c仍表示常数,同时将实数的乘法改为向量的数量积,便得到一个含有未知向量x的向量方程
It is well-known that the univariate quadratic equation with coefficients is real x2 + bx + c = 0. If the unknown x in the equation is replaced by the unknown vector x (the vector in this paper refers to the plane vector) and the constant b is changed to Constant vector b, c still represents a constant, while the multiplication of real numbers to the number of products of the vector, we get a vector equation with unknown vector x