2017 National Question 1 Single-choice Differentiating 2017_新课标II Paper 1.(5分) $\frac { 3 + i } { 1 + i } =$ ( ) A. 1+2iB. 1﹣2iC. 2+iD. 2﹣i Answer keyD ☆ SaveCan't do it, show the explanation查看原卷 →