\(\left\{{}\begin{matrix}I1=\dfrac{U1}{R1}=\dfrac{6}{R1}\\I2=\dfrac{U2}{R2}=\dfrac{9}{R2}\end{matrix}\right.\)
\(I1=I2\left(R1ntR2\right)\)
\(\Rightarrow\dfrac{6}{R1}=\dfrac{9}{R2}\Leftrightarrow\dfrac{R1}{R2}=\dfrac{6}{9}=\dfrac{2}{3}\)
Chọn C
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