[size=150][b][size=200]Suma[/size][/b][br][br][math]\LARGE\;z_1+z_2=(a+bi)+(c+di)=(a+c)+(b+d)i[/math][br][br][b][size=200]Resta[/size][/b][br][br][math]\LARGE\;z_1 - z_2=(a+bi) - (c+di) = (a - c) + (b - d)i[/math][br][br][b][size=200]Producte[/size][/b][br][br][math]\LARGE\;z_1 \cdot z_2 = (a + bi) \cdot( c+ di) = (a \cdot c - b \cdot d) + (a \cdot d + b \cdot c)i[/math][br][br][b][size=200]Divisió[/size][/b][br][br][math]\LARGE\; \frac{z_1}{ z_2} =\frac{\left(a+bi\right)}{\left(c+di \right)}=\frac{\left(a+bi\right) \cdot \left(c-di\right)}{\left(c+di \right)\cdot \left(c-di\right) }=\frac{\left(ac+bd\right)+\left(bc-ad\right)i}{c^2+d^2}[/math][br][/size]