题目z_1=2+4i,z_2=1+i那么(z_1)/(z_2)=()。A. 3+iB. 3-iC. 1+3iD. 1-3i$z_1=2+4i$,$z_2=1+i$那么$\frac{z_1}{z_2}=$()。A. $3+i$B. $3-i$C. $1+3i$D. $1-3i$题目解答答案A. $3+i$