题目

- Where is the school reading room?- . A . Yes, it is B . No, I don't know C . This way, please D . Don't ask me. I'm new here. 答案：C 设复数z1＝a＋bi，并且a2＋b2＝25，z2＝3＋4i，z1z2是纯虚数，求z1．