24-4 12-2 (1)当=时,A→000→000 2x,+2x 2 同解方程组为x2=x2 x=h11+k20 0 245 (2)当2=10时,A→011|→011→011 000)(000 2~3 同解方程组为x2=-x3∴x 3 3(1) 当 = 1时,           − → 0 0 0 0 0 0 2 4 4 A           − → 0 0 0 0 0 0 1 2 2 同解方程组为      = = = − + 3 3 2 2 1 2 2 2 3 x x x x x x x           +          −  = 1 0 2 0 1 2 x k1 k2 (2) 当 = 10时,           → 0 0 0 0 1 1 2 4 5 A           → 0 0 0 0 1 1 2 0 1           → 0 0 0 0 1 1 1 0 2 1 同解方程组为      = = − = − 3 3 2 3 2 3 1 1 x x x x x x           − −  = 1 1 2 1 x k           − −  =  2 2 1 x k