当k取何值时,多项式x2-3kxy-3y2+13xy-8中,不含xy项(  ) A.0 B.13 C.19 D.-19

问题描述:

当k取何值时,多项式x2-3kxy-3y2+

1
3
xy-8中,不含xy项(  )
A. 0
B.
1
3

C.
1
9

D. -
1
9

∵多项式x2-3kxy-3y2+

1
3
xy-8中不含xy项,
∴-3k+
1
3
=0,
∴k=
1
9

故选C.