Предмет: Алгебра, автор: horohordin691

найдите z1*z2, если z1=1+2i,z2=3+i

Ответы

Автор ответа: QDominus

У нас есть 2 комплексных числа. Умножим их так же, как и умножаем скобку на скобку:

$z_{1} \times z_{2} = (1 + 2i)(3 + i) = 3 + i + 6i + 2 {i}^{2} = \\ = 3 + 2( - 1) + 7i = 1 + 7i$

Ответ: 1+7i

Автор ответа: Amigo3

Ответ:(1+2i)*(3+i)=3+i+6i-2=1+7i

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