(2)由正规方程组U=SA,求A=S1)U Sk=∑X:k 8.K=0,1,2,3,4. S0=∑x=8:S1=∑x1=36:S2=∑x2=204 S3=∑x3=1296:S4=∑x=872 36204 ∴S=362041296 20412968772（2）由正规方程组U = SA，求A = S(-1) U ∵Sk =∑Xi k i = 1,2,………,8. K = 0,1,2,3,4. S0 = ∑xi =8; S1 = ∑xi =36; S2 = ∑xi =204; S3 = ∑xi =1296; S4 = ∑xi =8772 8 36 204 ∴ S = 36 204 1296 204 1296 8772 0 1 2 3 4