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Câu 3. Cho số phức $z = 2 - i$

Câu 3. Cho số phức z=2−iz = 2 - iz=2−i. Mệnh đề nào dưới đây đúng?

Thông tin câu hỏi

Câu 3. Cho số phức $z = 2 - i$ . Mệnh đề nào dưới đây đúng?