V = V 2 R 1 R 1 + R 3 = V 1 R 1 R 2 + R 1 {\displaystyle V=V_{2}{\frac {R_{1}}{R_{1}+R_{3}}}=V_{1}{\frac {R_{1}}{R_{2}+R_{1}}}} V 2 V 1 = R 1 + R 3 R 1 R 1 R 2 + R 3 {\displaystyle {\frac {V_{2}}{V_{1}}}={\frac {R_{1}+R_{3}}{R_{1}}}{\frac {R_{1}}{R_{2}+R_{3}}}} V 2 V 1 = R 1 + R 3 R 2 + R 3 {\displaystyle {\frac {V_{2}}{V_{1}}}={\frac {R_{1}+R_{3}}{R_{2}+R_{3}}}} V 2 V 1 = R 1 + R 3 R 2 + R 3 {\displaystyle {\frac {V_{2}}{V_{1}}}={\frac {R_{1}+R_{3}}{R_{2}+R_{3}}}}