(3x^2+2mx-x+1)+(2x^2-mx+5)-(5x^2-4mx-6x)
=3x^2+2mx-x+1+2x^2-mx+5-5x^2+4mx+6x
=(5m+5)x+5
值与X无关
所以5m+5=0
m=-1
m^2+(4m-5)+m
=1-4-5-1
=-9
(3x^2+2mx-x+1)+(2x^2-mx+5)-(5x^2-4mx-6x)
=3x^2+2mx-x+1+2x^2-mx+5-5x^2+4mx+6x
=(5m+5)x+5
值与X无关
所以5m+5=0
m=-1
m^2+(4m-5)+m
=1-4-5-1
=-9