2011 Tianjin Question 1 Single-choice Differentiating 2011_天津 Paper 1.$i$ 是虚数单位,复数 $\dfrac{1-3i}{1-i}=$ A. $2+i$B. $2-i$C. $-1+2i$D. $-1-2i$ Answer keyB ☆ SaveCan't do it, show the explanation查看原卷 →