1. Даны комплексные числа: z₁ = 2 - 3i, z₂ = i + 1, z₃ = -1 - i. Вычислите: a) z₁ + z₂; б) z₁ + z₃; в) z₁ - z₂; г) z₂ - z₃; д) z₁ * z₂; e) z₃ * z₂

a) z₁ + z₂ = (2 - 3i) + (1 + i) = 2 + 1 - 3i + i = 3 - 2i

б) z₁ + z₃ = (2 - 3i) + (-1 - i) = 2 - 1 - 3i - i = 1 - 4i

в) z₁ - z₂ = (2 - 3i) - (1 + i) = 2 - 1 - 3i - i = 1 - 4i

г) z₂ - z₃ = (1 + i) - (-1 - i) = 1 + 1 + i + i = 2 + 2i

д) z₁ * z₂ = (2 - 3i) * (1 + i) = 2 * 1 + 2 * i - 3i * 1 - 3i * i = 2 + 2i - 3i + 3 = 5 - i

e) z₃ * z₂ = (-1 - i) * (1 + i) = -1 * 1 - 1 * i - i * 1 - i * i = -1 - i - i + 1 = -2i