1245.4(x-1.2)<5
    2-2x^2>0
    2-2x^2>0
    -1/10x-90/x+8≥1.9
    -1/（10x）-90/x+8≥1.9
    -1/2*t*t-250t+30000>16610
    -t^2/2-250t+30000>16610
    -t^2+140t+12000>16610
    1
    -t^2/2+150t>16610
    -t*t/2+150t>16610
    -t/2+150t>16610
    t*t+60t>16610
    t^2+60t>16610
    t^2+60t>=16610
    6x^2-6x+1>0
    5x^2-5x+1>0
    3x^2-3x+1>0
    3x^2-3x+2>0
    3x^2-7x+2>0

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