# Four operations of the complex number Calculator

## Calculates the addition, subtraction, multiplication and division of the complex numbers.

 a+bi c+di 6dgt10dgt14dgt18dgt22dgt26dgt30dgt34dgt38dgt42dgt46dgt50dgt addition subtraction multiplication division
 $\normal Four\ operations\ of\ complex\ number\\\vspace{5}(1)\ (a+bi)+(c+di)=(a+c)+(b+d)i\\\vspace{5}(2)\ (a+bi)-(c+di)=(a-c)+(b-d)i\\\vspace{5}(3)\ (a+bi)(c+di)=(ac-bd)+(bc+ad)i\\(4)\ {\large\frac{a+bi}{c+di}}={\large\frac{ac+bd}{c^2+d^2}+{\large\frac{bc-ad}{c^2+d^2}i\\$

Sending completion

To improve this 'Four operations of the complex number Calculator', please fill in questionnaire.
Male or Female ?
Male Female
Age
Under 20 years old 20 years old level 30 years old level
40 years old level 50 years old level 60 years old level or over
Occupation
Elementary school/ Junior high-school student
High-school/ University/ Grad student A homemaker An office worker / A public employee
Self-employed people An engineer A teacher / A researcher
A retired people Others
Useful?
Very Useful A little Not at All
Purpose of use?