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我不大明白,若z是虛數,即為ai .(z-2)/(z²;+1)=(ai-2)/((ai)^2+1)=(ai-2)/(1-a^2)他要是屬於R的話,a不是該=0,還談什麼軌跡呢?若z是複數麼還好往下做的.
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