x²-2x+5=0怎么解?

问题描述:

x²-2x+5=0怎么解?

X1,2 = 【2土√(4-20)】/ 2
= (2土4i)/2
= 1 土 2 i
X1 = 1 + 2 i
X2 = 1 - 2 i