西安毛子律技大学XIDIANUNIVERSITYE0EBu1则AB :B22 E儿B21AlEBr1A +B,B + B210又 A,Bu + B210S则    = 21 22 11 1 B B B E A E E O AB . 1 11 21 1 22 11   + + = A B B A B B E 又 A1 B11 + B21   − −  +  −   − = 1 1 1 0 1 2 1 0 1 1 1 2   − −  +  − = 1 1 1 0 0 2 3 4 , 1 1 2 4  −− =    +  − + = 2 0 4 1 1 1 1 2 A1 B22 , 3 1 3 3  =