a, sơ đồ dễ vẽ thôi bạn tự vẽ nhé
b, R1 nt(R2//R3)
\(\Rightarrow Im=I1=I23=\dfrac{U}{Rtd}=\dfrac{27}{R1+\dfrac{R2R3}{R2+R3}}=1,8A\)
\(\Rightarrow U23=U2=U3=I23\left(\dfrac{R2R3}{R2+R3}\right)=10,8V\)
\(\Rightarrow\left\{{}\begin{matrix}I1=1,8A\\I2=\dfrac{10,8}{R2}=1,08A\\I3=I1-I2=0,72A\end{matrix}\right.\)
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