Respostas

2014-05-17T14:25:36-03:00
 \frac{1}{Req} =  \frac{1}{R1} + \frac{1}{R2} + \frac{1}{R3} + \frac{1}{R4}

 \frac{1}{Req} =  \frac{1}{4} + \frac{1}{2} + \frac{1}{1} + \frac{1}{1}

 \frac{1}{Req} =  \frac{1}{4} + \frac{1}{2} +1+1

 \frac{1}{Req} =  \frac{1}{4} + \frac{1}{2} +2

MMC = 4


 \frac{ \frac{4}{Req} }{4} = \frac{1}{4} + \frac{2}{4} + \frac{8}{4}

Simplifica o 4  no denominador .

 \frac{4}{Req} = 1+ 2+8

 \frac{4}{Req} = 11

Req =  \frac{4}{11} =  0,3636