(1)
z₁=7+3i , z₂= -1+√3i
(2)
z₁= -2+5i , z₂= -√3+i

1) z₁ + z₂ = 7+3i + (-1+√3) = 7 + 3i - 1 + √3i = 8 + 3i + √3i

z₁ - z₂ = 7+3i - (-1+√3) = 7 + 3i + 1 - √3i = 8 + 3i - √3i

z₁ * z₂ = (7+3i)(-1+√3i) = -7 +7√3i - 3i + 3i√3i

z₁ / z₂ = (7+3i)(7i+i)/(-1+√3i)(1 - √3i)

2) z₁= -2+5i , z₂= -√3+i

₁ + z₂ = -2+5i + (-√3+i) = -2+5i -√3 + i = 6i -2 - √3

z₁ - z₂ = -2+5i - (-√3+i) = -2+5i + √3 - i = 4i - 2 + √3

z₁ * z₂ = (-2+5i )(-√3+i) = 2√3 - 2i - 5i√3 + 5i²

z₁ / z₂ = (-2+5i)(2i - 5)/(-√3+i)(√3 - i)