若多项式x2-2kxy-3y2+12xy-x-100中不含xy项,则k取( ) A.1 B.-1 C.14 D.0
问题描述:
若多项式x2-2kxy-3y2+
xy-x-100中不含xy项,则k取( )1 2
A. 1
B. -1
C.
1 4
D. 0
答
∵x2-2kxy-3y2+
xy-x-100中不含xy项,1 2
∴-2k+
=0,1 2
∴k=
.1 4
故选:C.