数系的扩充是是从自然数到整数、有理数、实数直至复数.实际上,数系在扩充的时候,仍然遵循如下几项原则:第一(创造性原则)即数的概念的扩大,要能解决实际问题中遇到的矛盾;第二(继承性原则)要尽可能地保留原有的数集的性质,特别是它的运算性质,否则又会产生新的矛盾.这里的知识点是需要掌握复数的分类;其次是掌握两个复数只能说相等或不相等,而不能比较大小,当然如果两个复数是实数,则可以比较大小 The expansion of the number system is from natural numbers to integers, rational numbers, real numbers up to the complex number. In fact, while the number system is expanded, the following principles are still followed: First, the principle of creativity, ie the expansion of the concept of numbers, can be solved The contradictions encountered in practical problems; the second (the principle of inheritance) to retain as much as possible the nature of the original number set, especially its operational nature, otherwise it will create new contradictions here is the need to master the knowledge Plural classification; the second is to master the two complex can only say equal or not equal, but not the size, of course, if the two complex numbers are real, you can compare the size