(1+i)(2+i)
问题描述:
(1+i)(2+i)
正确答案为1-3i,可是我算出来是1+3i,
答
(1+i)(2+i)
=2+i+2i+i²
=2+3i-1
=1+3i
正确答案是1+3i .
共扼是1-3i.