1/3x-1大于0
    （1/（x+4））+1>-1/（x+6）
    x^2+x≤0
    x^2*x≤0
    7x<15
    -5(x-70)^2+4500-200≥3920
    -a^(2)-3a=1
    -3a≥1
    -x^2+110x-2400=782
    45a+8-3/2a≥240 1700a+1300*8-1300*45a≤10000
    800000*x*(1+x)^180/((1+x)^180-1)<6699.1
    （x-0.008374）（1+x）^180>0.008374
    x+1/x
    x>-3
    -7x≤-7
    -x≥-8
    2x-3
    2/3x+1>-1
    x/2-1>x
    2x-1/3>=5/4x-5

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