Question

URGENT !! exercitiile 1 (a,b,c ) si 2
dau coroana celui mai explicit raspuns

Answer 1

[tex]1a)(2- \frac{1}{3})+(-3i- \frac{2}{5}i)= \frac{5}{3} - \frac{17}{5}i \\ b) \frac{5}{3} - \frac{35}{2}i- \frac{2}{3}i+7i^2=( \frac{5}{3}-7)+(- \frac{35}{2}- \frac{2}{3})i=- \frac{16}{3}- \frac{109}{6}i \\ c) \frac{(2-3i)(7-i)}{(7+i)(7-i)}= \frac{14-2i-21i-3}{50}= \frac{11-23i}{50} = \frac{11}{50}- \frac{23}{50}i \\ 2)z( 3+2i+5)=4 \\ z= \frac{4}{8+2i} \\ z= \frac{2(4-i)}{(4+i)(4-i)} = \frac{2(4-i)}{17}= \frac{8}{17}- \frac{1}{17}i [/tex]