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d_trnth
2 năm trước
1) $z^{2}$ - (2+i)z + i + 1 =0 Gọi $z_{0}$ là nghiệm có phần ảo âm. Tìm $(z_{0})^2$ + 3i 2) Phương trình $z^{2}$ + az + b =0 có nghiệm z=1+2i. Tính a+b
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