若多项式3x2-2xy+y2+kxy-x-5不含xy项,则k=

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若多项式3x2-2xy+y2+kxy-x-5不含xy项,则k=

若多项式3x2-2xy+y2+kxy-x-5不含xy项,则k=
若多项式3x2-2xy+y2+kxy-x-5不含xy项,则k=

若多项式3x2-2xy+y2+kxy-x-5不含xy项,则k=
3x2-2xy+y2+kxy-x-5
=3x²(-2+k)xy+y²-x-5
-2+k=0
k=2