已知复数z1=1-i，z2=2+i，那么z1•z2的值是______．
人气：498 ℃ 时间：2020-04-23 04:04:49
解答
∵复数z1=1-i，z2=2+i，
∴z1•z2=（1-i）（2+i）=2+i-2i-i2=3-i
故答案为：3-i
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