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(01全国卷理) (12分)
已知复数z1 = i (1-i) 3.
(Ⅰ)求arg z1及;
(Ⅱ)当复数z满足=1,求的最大值.
Ⅰ.求arg z1及|z1|;
Ⅱ.当复数z满足|z|=1,求|z-z1|的最大值.