Question

Вычислить:(1+2 i)*(2-i)+(3-2 i)*(2-3 i)

Answer 1

(1+2 i)*(2-i)+(3-2 i)*(2-3 i)=2-i+4i-2i^2+6-9i-4i+6i^2=4i^2-10i+8

Answer 2

(2-i+4i-i)+(6-9i-4i+6i^2),i^2=-1
(2+2i)+(6-13i-6)=2+2i-13i=2-11i