-5t^2+12t-2>0
    -3x^2+5x-4>0
    -3x^2+5x-4
    6/a<=-1/2
    1/a>=2
    dxhh
    x^2＋5x－45577＞0
    t^2-8t+15>0
    t^2+4t+3>0
    t^2+4t+3<0
    t^2-4t=3<0
    5x-10<20
    （6x+180）:(5x+30)=18:11
    3t^2-4t+1>0
    3t^-4t<0
    3t^2-3t+1>0
    x^2+x-1/2>0 x^2+x+1/2<0
    x^2+x-1/2>0
    2400×（200000－25000t）×（1－t）≥9000000
    1/(8x)<=1

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