Răspunsuri

2014-11-02T16:18:44+02:00
A)12-20i-15+12i+40-30i=-3-8i+40-30i=37-38i

b)20+25i-12i-15i=20-2i*(4+5i)=80+100i-8i-10i=(80-82i)(3-4i)=240-320i-246i
+328i=240-236i