Question

Помогите кто чем может!

Answer 1

1. 1) z1+z2=-10+8i+4-10i=-6-2i

2) z2-z3=4-10i-(8+10i)=-4-20i

3) =-40+100i+32i+80=40+132i

4) =(4-10i)(8-10i)/(8+10i)(8-10i)=

(32-40i-80i+100)/(64+100)=≈ 0.80-0.73i

5) |z1|=√((-10)²+(8²))=√164, |z2|= √((4)²+(-10)²)=√116 ; |z1|*|z2|=≈ 138

6) tgф1=8/(-10)=-0.8, ф1=≈180-39°= 141°

tgф2=-40, ф2=≈-89°