若多项式x2-2kxy-3y2+12xy-x-100中不含xy项,则k取(  )A. 1B. -1C. 14D. 0

问题描述:

若多项式x2-2kxy-3y2+

1
2
xy-x-100中不含xy项,则k取(  )
A. 1
B. -1
C.
1
4

D. 0

∵x2-2kxy-3y2+

1
2
xy-x-100中不含xy项,
∴-2k+
1
2
=0,
∴k=
1
4

故选:C.
答案解析:根据多项式x2-2kxy-3y2+
1
2
xy-x-100中不含xy项,得出xy项得系数和为0,进而求出即可.
考试点:多项式.
知识点:此题主要考查了多项式相关定义,得出xy项得系数和为0是解题关键.