复 数
【知识梳理】
复数的基本概念1、虚数单位的性质
<Object: word/embeddings/oleObject1.bin>
叫做虚数单位，并规定：①
<Object: word/embeddings/oleObject2.bin>
可与实数进行四则运算；②
<Object: word/embeddings/oleObject3.bin>
；这样方程
<Object: word/embeddings/oleObject4.bin>
就有解了，解为
<Object: word/embeddings/oleObject5.bin>
或<Object: word/embeddings/oleObject6.bin>
2、复数的概念
（1）定义：形如<Object: word/embeddings/oleObject7.bin>
(a，b∈R)的数叫做复数，其中
<Object: word/embeddings/oleObject8.bin>
叫做虚数单位，
a叫做，b叫做。全体复数所成的集合
<Object: word/embeddings/oleObject9.bin>
叫做复 ...