=(∑|;D1∑|a|x 1/(1-a)ul-a ≠L ≠ 12-anlx:R21a1x;0-a)-a>0 ≠ =l|x121-u-a-a ≠L返回  − −  =  = =   1/ (1 ) 1 1 1 ( | |) [ | | | | ] n j i j n j i j i j i j j a a x     − −  = −   1/ (1 ) 1 1 | | | | [ | | | | ] n j i j i i i i i j j a x R a x Ri  0     − −  =   − 1/ (1 ) 1 1 | | [ | | | | ] | | n j i j i i j j i i i x a x R a