0005005000 000 0tI70 0005 0000 020000 00050040 204 000 000 005 004 000 000 000100 00 故r(4)=3A . A ( ) 3 0 0 0 0 0 0 1 0 0 1 0 0 1 0 0 0 0 0 0 0 0 0 1 4 0 1 0 0 1 0 0 0 0 0 0 0 0 0 5 4 0 1 0 0 1 0 0 0 0 0 0 0 0 0 5 4 0 1 0 1 1 0 0 1 0 0 5 4 0 0 0 0 0 2 0 2 1 0 0 1 0 4 5 0 0 1 0 1 0 2 0 2 1 0 0 1 1 4 5 1 3 1 0 4 1 2 0 1 1 0 0 1 =               ⎯→               ⎯→               ⎯→               − ⎯→               − ⎯→               − − ⎯→               − − = 故 r