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Sagot :

[tex]R1 = \frac{1}{3}+3 = \frac{10}{3} \\ \\R2 = R1*4=\frac{10}{3}*4 = \frac{40}{3} \\ \\R2-12=\frac{40}{3}-\frac{36}{3}= \frac{4}{3}[/tex]

R1= 1/3+3 = 10/3 R2= 10/3*4 =40/3 R3 = 40/3-12 = 40/3-36/3= 4/3. J'espère t'avoir aidé.

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