Réponse :
4.a) axb = -60/28 ; b) a+b = (21-60)/28 = -39/28 ; c) a/b = -3/4x7/15 = -7/20
d)-39/28/ (3/4+15/7) = -39/28/((21+60)/28) = -39/28x28/81 = -39/81 = -13/27
5. 1/R = (R1+R2)/ R1R2 => R = R1R2/(R1 + R2) = 240/32 = 15/2 ohm
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Explications étape par étape
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Réponse :
4.a) axb = -60/28 ; b) a+b = (21-60)/28 = -39/28 ; c) a/b = -3/4x7/15 = -7/20
d)-39/28/ (3/4+15/7) = -39/28/((21+60)/28) = -39/28x28/81 = -39/81 = -13/27
5. 1/R = (R1+R2)/ R1R2 => R = R1R2/(R1 + R2) = 240/32 = 15/2 ohm
Bonne journée
Explications étape par étape