首先要注意a1,a2,a3线性无关,然后 (b,Ab,A^2b)=(a1,a2,a3)*V,其中V=1 x1 x1^21 x2 x2^21 x3 x3^2是Vandermonde矩阵,由于x1,x2,x3互不相同,V非奇异,所以b,Ab,A^2b线性无关.0=A^3b-(3Ab-2A^2b)=(x1^3+2x1^2-3x1)a1+(x2...