f(x)的常数项为f(0),即行列式
0 3 1 2
0 0 -2 1
2 1 0 4
0 2 1 0
=2|{3,1,2},{0,-2,1},{2,1,0}|,而行列式
3 1 2
0 -2 1 =3*(-1)+2*(1+4)=-3+10=7
2 1 0
∴f(0)=2*7=14,即f(x)常数项为14
f(x)= 2x 3 1 2 x x -2 1 2 1 x 4 x 2 1 4x
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