-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
    （1+2x）÷3>x-1
    (x-2)(x-3)>-2/9
    (x-1)(x-2)>-4/9
    26700+X-X*2.5%=50000
    X/2X-1>1
    {6/2x-5≥4/3x+1-2/3x 4（2x-1）>3(4x+2)
    6/2x-5≥4/3x+1-2/3x 4（2x-1）>3(4x+2)

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