Question

se consideră numerele complexe z1=2+i,z2=1+2i.Sa se calculeze z1+z2+z1•z2

Answer 1

z1+z2+z1*z2 = 2+i+1+2i+(2+i)(1+2i) =

= 3+3i + (2+4i+i+2i²) = 3+3i+(2+4i+i-2) =

= 3+3i+5i = 3+8i

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Stim ca i²=-1.