2) z1+z2=-5+i+1+2i=-4+3i
Z1-z2=-5+i-1-2i=-6-i
3)(-5+i)/(1+2i)=(-5+i)(1-2i)/(1+2i)(1-2i)=(-5+10i+i+2)/(1+4)=(-3+11i)/5
1)/z1/=sqrt(25-1)=2sqrt6
/z2/=sqrt(1+4i^2)=sqrt(1-4) =sqrt(-3)= i×sqrt3
2) z1+z2=-5+i+1+2i=-4+3i
Z1-z2=-5+i-1-2i=-6-i
3)(-5+i)/(1+2i)=(-5+i)(1-2i)/(1+2i)(1-2i)=(-5+10i+i+2)/(1+4)=(-3+11i)/5
1)/z1/=sqrt(25-1)=2sqrt6
/z2/=sqrt(1+4i^2)=sqrt(1-4) =sqrt(-3)= i×sqrt3