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처음 봤 어 요.복수 문 제 는 허수 단위 i 가 없 는 상황 이에 요.잘못 거 셨 잖 아 요.z^3=1(1 은 i 죠) 그렇다면 i^2=-1,득 z=-i,그러면 원 식=18-i
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