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Câu hỏi: Số phức $z$ thỏa mãn $\left( 1-i \right)z+i=0$ là
A. $z=-\dfrac{1}{2}-\dfrac{1}{2}i$.
B. $z=\dfrac{1}{2}+\dfrac{1}{2}i$.
C. $z=\dfrac{1}{2}-\dfrac{1}{2}i$.
D. $z=-\dfrac{1}{2}+\dfrac{1}{2}i$.
A. $z=-\dfrac{1}{2}-\dfrac{1}{2}i$.
B. $z=\dfrac{1}{2}+\dfrac{1}{2}i$.
C. $z=\dfrac{1}{2}-\dfrac{1}{2}i$.
D. $z=-\dfrac{1}{2}+\dfrac{1}{2}i$.
Số phức $\left( 1-i \right)z+i=0$ $\Leftrightarrow z=\dfrac{-i}{1-i}=\dfrac{1}{2}-\dfrac{1}{2}i$.
Đáp án C.