支路电流法:i1+i2+i6=0,i2=i3+i4,i4+i6=i5,i1R1=i2R2+i3R3+us3,i3R3+us3=i4R4+i5R5,i6R6+us6=i2R2+i4R4。网孔电流法:(R2+R4+R6)ia-R2ib-R4ic=-us6,(R1+R2+R3)ib-R2ia-R3ic=-us3,(R3+R4+R5)ic-R4ia-R3ib=us3,i5=ic。