-2/a>0
    6X≤23
    (2m-1)^2-4(m^2-1)>0
    2m^2-4m^2-4m-5>0
     6000+（80-x）*（200-10x）-10*（400-10x） ≥ 9000
    6000+（80-x）*（200-10x）-10*（400-10x）=9000
    x^2-1>0
    X ^ 2-x + 2< 0
    -3x^2+4x<0
    e(-12)*1.8
    e(-7)*1.7
    e(-5)*6.4
    e(-0.5)*6.4
    e(-7) *1.7
    e(-7)
    6.4*e(-0.5)
    1.1*e(-11)
    3.3/(75+25)*25=x
    3.3/(75+25)25=x
    3.3/(75+x)x=1.248

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