arg(1-i) = arctan(-1/1)
= 7π/4这类问题是怎么求呢？求解答。。。谢谢了x = a+biif a, b > 0 (第一象限)if a<0 , b>0 (第二象限)if a<0 , b<0 (第三象限)if a>0 , b<0 (第四象限)arg(a+bi) = arctan(b/a)