47 4243 422 21 1 u22 23 a33 2412 3 12141 121412+u2 1243+423 1312411131412+132u22 13i413+132423+33 由a,=4,→4，=4，(j=1,2,3) 由a=4h1→41=24：41=4k1→41=4 141 由a22=242+42→42=a2-l2142a23=l214g+423→423=a23-h214 由aa=%14a+l→a--42 1422 由a3=131413+l32423+43→43=43-(3143+l2423) This document is produced by trial version of Print2Flash. Visit www.print2flash.com for more information