Ta có: \(\dfrac{U_1}{U_1-U_2}=\dfrac{I_1}{I_1-I_2}\Rightarrow\dfrac{10}{U_1-U_2}=\dfrac{1,25}{1,25-0,75}\)
\( \Rightarrow U_1-U_2=4\)
Copyright © 2021 HOCTAP247