12A44s 2Q 5s 8 6 叠加定理12A49 29 5 6 r"=×12=64 49 2 492 29 (2) 8 41A 5Q2 49 8 6Q 1=1+/(2 (1) 6+1=7 7A45 2 6 4 4 8V I 12A 叠加定理 5 2 6 4 4 (1) I 12A 4 2 ( 2) I 6 4 8V 5 I 12 6A 2 (1) 1 =  = I 1A 4 4 ( 2) 8 = + = (1) ( 2) I = I + I = 6 + 1 = 7A