(1)315 321100(321100 解315010~0-14-110 323001(002-101 203/20-1/2)(300722-9/2 0-1011-2~0-101 (002-101)(001-l/201/2 00762/3-3/2 010-1-12 001-1/201/2 723 故逆矩阵为 611202 02 1-2-3-2 0121(1) 323 513 123 解 100 010 001 323 513 123 ~ 101 011 001 200 410 123 ~ 101200 211010 2/102/3023 ~ 2/102/1100 211010 2/922/7003 ~ 2/102/1100 211010 2/33/26/7001 故逆矩阵为 2 1 0 2 1 211 2 3 3 2 6 7 (2) 1210 2321 1220 1023