问题描述: 实数m取何值时,复数z=(m²-3m)+(2m²-5m-3)i是①实数?②虚数?③纯虚数? 1个回答 分类:数学 2014-10-04 问题解答: 我来补答 ①实数2m²-5m-3=0(2m+1)(m-3)=0m=-1/2或m=3②虚数2m²-5m-3≠0(2m+1)(m-3)≠0m≠-1/2且m≠3③纯虚数m²-3m=0m(m-3)=0m=0,m=32m²-5m-3≠0m≠-1/2且m≠3∴m=0 展开全文阅读