若多项式2(x²-3xy-y²)-(x²+2mxy+2y²}中不含xy项,则m等于多少?

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若多项式2(x²-3xy-y²)-(x²+2mxy+2y²}中不含xy项,则m等于多少?若多项式2(x²-3xy-y²)-(x²+

若多项式2(x²-3xy-y²)-(x²+2mxy+2y²}中不含xy项,则m等于多少?
若多项式2(x²-3xy-y²)-(x²+2mxy+2y²}中不含xy项,则m等于多少?