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trongtin12


goi z1,z2 la 2 nghiem phuc cua pt (4z-7i-3)\(z-2i)=z-i
tinh gia tri bieu thuc |z1|^2 nhân|z2|^2
tinh gia tri bieu thuc |z1|^2 nhân|z2|^2
goi z1,z2 la 2 nghiem phuc cua pt [TEX]\fr{4z-7i-3}{z-2i}=z-i[/TEX]
tinh gia tri bieu thuc [TEX]|z_1|^2 .|z_2|^2[/TEX]
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