(2mx²-x²+3x-1)-(5x²-4y²+3x)
=(2m-1-5)x²+3x-1+4y²-3x
不含x²项所以2m-1-5=0
解得,m=3
2m³-【3m²+(4m-5)+m】
=2m³-3m²-(4m-5)-m
=2m³-3m²-5m+5
=2*3³-3³-10
=3³-10
=17
(2mx²-x²+3x-1)-(5x²-4y²+3x)
=(2m-1-5)x²+3x-1+4y²-3x
不含x²项所以2m-1-5=0
解得,m=3
2m³-【3m²+(4m-5)+m】
=2m³-3m²-(4m-5)-m
=2m³-3m²-5m+5
=2*3³-3³-10
=3³-10
=17