Question

Answer 1

\(R_{tđ}=\dfrac{R_1.R_2}{R_1+R_2}=\dfrac{6.3}{6+3}=2\left(\Omega\right)\)

\(I=\dfrac{U}{R_{tđ}}=\dfrac{6}{2}=3\left(A\right)\)

Answer 2

\(\left[{}\begin{matrix}R=\dfrac{R1.R2}{R1+R2}=\dfrac{6.3}{6+3}=2\left(\Omega\right)\\I=U:R=6:2=3\left(A\right)\end{matrix}\right.\)

Answer 3