2000-50n≥2.085√n
    -m^2+5m≤6
    -2x^2+3x+2>0
    abs(x+2)>abs(2x^2+3x-2)
    3x+28≥-x^2
    -4082750+3000000+x-45000-x*0.1/4>300000
    xx+5x+4>0
    xx-2x-3<0
    x+1<0
    （51*x）/(51+x)^2>0.65
    1/2<=1/x<=2
    （118-x）/10＞ln（50/（x-68））
    x^2+4899x+2500＜0
    ＜8/（20×r2/20+r2）＞-8/r2＝0.4
    4x-1/x+1＞3
    50≤X≤86
    2x+1＜x+11
    x*(36-3*x)>=105
    36-3*x>20
    36-3*x>2

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