多项式2(x²-3xy-y²)-(x²-3mxy+2y²)
=2x²-6xy-2y²-x²+3mxy-2y²
=x²+(3m-6)xy-4y²
∵不含xy项
∴3m-6=0
∴m=2
若多项式2(x²-3xy-y²)-(x²-3mxy+2y²)中不含xy项,则m等于( )
若多项式2(x²-3xy-y²)-(x²-3mxy+2y²)中不含xy项,则m等于( )
若多项式2(x²-3xy-y²)-(x²-3mxy+2y²)中不含xy项,则m等于( )
若多项式2(x²-3xy-y²)-(x²-3mxy+2y²)中不含xy项,则m等于( )
数学人气:801 ℃时间:2019-08-18 00:08:33
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