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四.关于解方程(组)的题必须注意(1)在复数范围内解一元n次方程一定有n个根。(2)在复数范围内解方程,方程的系数不一定是实数。在解实系数高次方程时除了常用到虚根成对出现外有时还要用到多项式恒等定理。(3)在复数范围内解方程除可用实数中的方法外(有的学生以为对复系数的二次方程不能用求根公式)尚可
4. Questions on solving equations (groups) must be noted that (1) There must be n roots for solving an n-th order equation within a complex number. (2) Solve the equations within the complex number. The coefficients of the equations are not necessarily real numbers. In addition to the appearance of virtual root pairs, it is sometimes necessary to use the polynomial identity theorem when solving high-order equations of real coefficients. (3) Solve the equations in the complex number except for the method in real numbers (Some students think that the quadratic equation for complex coefficients cannot use the root-finding formula).