∣z∣=a2+b2|z| = \sqrt{a^2 + b^2}∣z∣=a2+b2; zˉ=a−ib\bar z = a - ibzˉ=a−ib; zzˉ=∣z∣2z \bar z = |z|^2zzˉ=∣z∣2.