\(R1=R2=2R3\) đúng ko bạn?
\(=>R1ntR2ntR3=>Rtđ=R1+R2+R3=R1+R1+\dfrac{R1}{2}\left(ôm\right)\)
\(=>Rtđ=\dfrac{U}{I}=\dfrac{50}{2}=25\left(ôm\right)\)
\(=>R1+R1+\dfrac{R1}{2}=25=>R1=10\left(ôm\right)=R2\)
\(=>R3=\dfrac{R1}{2}=\dfrac{10}{2}=5\left(ôm\right)\)