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[分析] |z|=2的图形是个圆,|z＇+i|=2的图形也是一个圆。问题化为求后一个圆上离原点最远的点的距离。
The [analysis]|z|=2 graph is a circle, and the graph of |z’+i|=2 is also a circle. The problem is to find the distance from the point farthest away from the origin on the next circle.