2013 Guangdong Question 3 Free-response Differentiating 2013_退役省自主命题 (2013·文) 3.(2013广东,文3)若i(x+yi)=3+4i,x,y∈R,则复数x+yi的模是( ). A. 2B. 3C. 4D. 5 Answer keyD ☆ SaveCan't do it, show the explanation查看原卷 →