Respostas

2013-05-14T12:07:12-03:00

a)(3-2i)-(1+3i)

 

3-2i-1-3i

 

\boxed{2-5i}

 

b)(9+4i)+(5-2i)-(8-i)

 

9+4i+5-2i-8+i

 

\boxed{6+3i}

 

c)(12-3i)-(1+i)+(8+7i)

 

12-3i-1-i+8+7i

 

\boxed{19+3i}

 

d)7(5+2i)

 

\boxed{35+14i}

 

e)(6+i)\cdot{(6-i)}

 

6^2-i^2

 

36-(-1)

 

\boxed{37}