【答案】A
4. 若复数z?1?i?( )
a?i是实数(其中a?R,i是虚数单位),则a? 1?iA.?1 B.0 C.1 D.2
【答案】C. 【解析】解法一:
z?1?i?数,??a?i??1?i??1?i?a?1??a?1?i??1?a?1??a?1?i是实a?i?1?i???1?i22?2?1?i??1?i??a?1?0,?a?1,故选C. 2解法二:故选C.
z?1?i?a?i?1?i??1?i???a?i??2?a??i??是实数,?2?a?1,?a?1,1?i1?i1?i5. 已知复数z1?3?4i,z2?t?i,且z1?z2是实数,则实数t等于( ) A.
3443 B. C.? D.? 4334【答案】A
相关推荐: