1.已知z1z_{1}z1,z2z_{2}z2是关于xxx的方程x2−2x+2=0x^{2}-2x+2=0x2−2x+2=0的两个根.若z1=1+iz_{1}=1+iz1=1+i,则∣z2∣=(\vert z_{2}\vert =(∣z2∣=( )))