当k=_时,多项式3x2-2kxy+3y2+1/2xy-4中不含xy项.
问题描述:
当k=______时,多项式3x2-2kxy+3y2+
xy-4中不含xy项. 1 2
答
∵多项式3x2-2kxy+3y2+
xy-4中不含xy项,1 2
∴-2k+
=0,1 2
解得k=
.1 4
故答案为:
.1 4