Question

me ajudem Pfvr!!!!!!​

Answer 1

Explicação:

$req = r + r + r + r \\ req = 7 + 4 + 7 + 7 \\ req = 25$

$\frac{1}{req} = \frac{1}{r} + \frac{1}{r} + \frac{1}{r } \\ \\ \frac{1}{req} = \frac{1}{10} + \frac{1}{15} + \frac{1}{12} \\ \\ \frac{1}{req} = \frac{12 + 8 + 10}{120} \\ \frac{1}{req} = \frac{30}{120} \\ req = 4$