n^2+n+4042＞0
    （500-100/（60000-X））×0.75＋（500-100/（20000-X））×0.25≥500-100/30000
    -2x≥3x （2-x）/2>-1
    2x-1>-3
    1-x≥0
    （1+3x）/2>2x-1
    1000*x^2<2^x
    2(x+4)≤5（x+2）
    1.155*85<200y*0.001
    2x-2＞3x-4
    4-2x＞4x-3
    2x-1＜4x+12
    0
    475655x＞4544
    -x＾2+6≥x
    0.5x+1.5(30-x)≥28
    0.5x+1.5(30-x)≤30
    x*x+9>0
    50(96-a)+80a<=5720
    1-3x＜10

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