DP-2: Find: V1,v2, V3 2 02-D1⊥b2⊥b3-0 +2 1A+ A 2 5 1,U2=3,U3=-2 (与电流源串联的电阻不介入节点方程) R Find: P2v =lA P=2w Find: p U2A=0P4=01 2 3 DP − 2 :Find : v ,v ,v 5  2 − 3 = 1, 3, 2 1 = 2 = 3 = − (与电流源串联的电阻不介入节点方程) Find:P2V . Find: P2A. i 1 = 1A P2V = 2W 2A = 0 P2A = 0 2 1 1 1 1 1 2 1 3 = − + − +      2 1 1 1 2 1 2 3 1 = − + +  −    − + 2V 2A 1 1 1 1 1 1 i − +  2A + 5V − 1  2  3 Re f