Question

ДАЮ 100 БАЛОВ ЗА ПРАВИЛЬНЫЙ ОТВЕТ

Answer 1

Ответ:

$r1.2 = r1 + r2 \\ r3.4 = r3 + r4 \\ \frac{1}{r1.2.3.4} = \frac{1}{r1.2} + \frac{1}{r3.4} \\ r1.2 = 10 + 2 = 12om \\ r3.4 = 3 + 4 = 7om \\ \frac{1}{r1.2.3.4} = \frac{1}{12} + \frac{1}{7} = \frac{19}{84} \\ r 1.2.3.4. = 4.42om$