线性代数重点难点30讲 1 x1(x1 -1)x2(x2- x(x1-1)x2(x2-1) r(x,-1) x(x1-1)x2(x2-1) n2(xn-1) xx… )〔 解法2原行列式添加一行及一列,得 0 D=0x1(x1-1)x2(x2-1)…x,(xn-1) 0x1(x1-1)x21(x2-1)