Question

Найдите сумму и произведение комплексных чисел Z1=3-5i; z2=-1+2i

Answer 1

3-5i+(-1+2i) = 3-1 -(5+2)i = 2-3i
(3-5i)(-1+2i) = -3+6i+5i-10(i^2)= -3+11i+10 = 7+11i

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(i)^2 = -1
-10*-1 = +10