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Bonjour j’ai besoin d’aide svp merci d’avance

Bonjour Jai Besoin Daide Svp Merci Davance class=

Sagot :

Bonjour,

1) 1/Req = 1/R1 + 1/R2 = R2+R1/(R1R2)

Req = R1R2/(R1+R2) = 5R2/(5+R2)

2) a) f(20) = 5*20/(5+20) = 100/25 = 4

b) [tex]f(x) = 3\\\\\frac{5x}{5+x}= 3\\\\5x = 3*(5+x)\\\\5x = 15 + 3x\\\\2x = 15\\\\x = 15/2 = 7.5[/tex]