@ @S@ @†a‡Èÿa@ @ 0N 4 N () N 3 .4 () 3 N 3 N () .5 .3 N () 5 N N6 .3 2 1002 1+0+0+2 = 3 6 4 02 5 .3 .4 .5 0 ) .( .144 = 2 ×2 ×2 ×2 × 3 × 3 = 24 × 32 () . : 144