Question

Z = Z1/ Z2; комплексное число Z1 =8 + i, Z2 = 1 + 2i

Answer 1

$Z=frac{Z_1}{Z_2}= frac{8+i}{1+2i} = frac{(8+i)(1-2i)}{(1+2i)(1-2i)} = frac{8-16i+i-2i^2}{1-4i^2} = frac{8-15i+2}{1+4} = frac{10-15i}{5} =\\=2-3i$