u1=1xi1=i1，i=i1-i2..........(1)10=u1+ (1xi2) + 2u1=3u1+i2..........(2)i2+2u1=2i， i2+2i1=2i1-2i2，3i2=0，i2=0，i2=0代入(2) 3u1=10，u1=10/3 v。代入(1) i=i1=u1=10/3 A
