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复数z(a,b)ba②z=a+bi《复数》公式汇总一、复数的基本概念1、虚数单位:ii2=-12、复数的定义:z=a+bi(复数)(实部)(虚部)当a=0时,z=bi(纯虚数)当b=0时,z=a(实数)二、复数的几何意义,复平面z=a+bi坐标:z(a,b)三、复数的模(|z|)|z|=√a2+b2四、共轭复数(z)z=a+biz=a-bi五、复数的四则运算加法:(a+bi)+(c+di)=a+bi+c+di=(a+c)+(b+d)i减法:(a+bi)-(c+di)=a+bi-c-di=(a-c)+(b-d)i乘法:(a+bi)(c+di)=ac+adi+bci+bdi2=ac+adi+bci-bd=(ac-bd)+(ad+bc)i(a+bi)2=a2+(bi)2+2abi=a2+b2i2+2abi=a2-b2+2abi(a-bi)2=a2+(bi)2-2abi=a2+b2i2-2abi=a2-b2-2abi除法:11·iiiaiai·iai2-a1a-bia-bia-bia-bia+bi(a+bi)(a-bi)a2-(bi)2a2-b2i2a2+b2①②
本文标题:复数-公式汇总
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