Question

Помогите,1,3,5,7,а я вам баллы

Answer 1

1)

R = R1 + R2 +...Rn

R = 2 + 15 = 17 Ом

3)

$R = \frac{R1 \times \: R2}{R1 + R2}$

$R = \frac{50 \times 80}{50 + 80} = 30.77 \: Ом$

5)

R = R1 + R2 +...Rn

R = 86 - 42 = 44 Ом

7)

$\frac{1}{R} = \frac{1}{R1} + \frac{1}{R2} + ... \frac{1}{Rn}$

$\frac{1}{R1} = \frac{1}{R} - \frac{1}{R2}$

$\frac{1}{18} - \frac{1}{27} = \frac{3}{54} - \frac{2}{54} = \frac{1}{54}$

Ответ: 54 Ом