风+RR贴=- 3=s 求解上式可得到电阻R的电流和电阻R2上电压42 i、 -R 2=+刘 R+凡队+R+ (4-2) 其中 =io=R+R 5-产R4求解上式可得到电阻R1的电流i 1和电阻R2上电压u2 (4 2) 1 S 1 1 1 2 2 S 1 2 1 = + − + − + + = ' " i i i R R R u R R i 其中 S 1 2 2 1 1 0 S 1 2 1 1 0 S S 1 i R R R i i u R R i i u " i ' + − = = + = = = = (4 1) ( ) 3 S 1 2 1 2 3 S −    = + + = i i R R i R i u