1 1 2 31 2-x^2 2 32 3 1 52 3 1 9-x^2 r2-r1,r4-r3=1 1 2 30 1-x^2 0 02 3 1 50 0 0 4-x^2 = k(1-x^2)(4-x^2). (k为非零常数) 所以 x=1,-1,2,-2
行列式最后结果呢
