Question

Mn giải giúp mình tối mình cô kiểm tra rồi

Answer 1

R1 nt R2 nt R 3 nt R4

\(\Rightarrow\left\{{}\begin{matrix}U1+U2=10V\\U2+U3=14V\\U3+U4=18V\end{matrix}\right.\)

\(\Rightarrow\dfrac{14}{18}=\dfrac{Im.R23}{Im.R34}=\dfrac{\dfrac{Um.R23}{14+R2+R3}}{\dfrac{Um.R34}{14+R2+R3}}=\dfrac{R2+R3}{R3+R4}=\dfrac{R2+R3}{R3+10}\Rightarrow R2=.....R3\left(1\right)\)

lai co \(\dfrac{10}{18}=\dfrac{R1+R2}{R3+R4}=\dfrac{4+R2}{R3+10}\left(2\right)\)

\(\left(1\right)\left(2\right)\Rightarrow\left\{{}\begin{matrix}R2=...\\R3=...\end{matrix}\right.\)