6X^2-X-1/X^2+1<0
    (x+1)(3x+1)<=0
    x^3<9
    x3<9
    3x+4≥7/x
    3y+2.5(2600-y)≤7000
    x
    x<=cos(x)
    x<=sin(x)
    -（x^2-6x+5)≥0
    X- 1小于x/3+1
    240x+180(3/2x+5)≤21300
    abs(2x-1)>3x
    x^2-4*x-5<0
    x^2-4x-5<0
    a≤150-3a
    4*4^n+27n>=6070
    4*4^n+27n>=6.70
    0<=X<=1
    1000＜0.3X＜2000

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