若z∈C且|z|=1,则|z-3i|的最小值为
若z∈C且|z|=1,则|z-3i|的最小值为
数学人气：785 ℃时间：2020-04-23 18:58:54
优质解答
2=|3i|-|z|≤|z-3i|≤|3i|+|z|=4
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