i1网孔: 12=(10+20)i1-20i2-10i3,6=15i1-10i2-5i3............(1)
i2网孔: (20+20+40)i2-20i1-20i3=0,4i2=i1+i3................(2)
i3网孔: (20+20+10)i3-10i1-20i2=0,5i3=i1+2i2.............(3)
(3)代入(1) 6=14i1-12i2,3=7i1-6i2............(4)
(2)x5 - (3) 18i2=6i1,i1=3i2,代入(4) 3=15i2,i2=0.2A,i1=0.6A,i3=0.2A。
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