50(1500-4x^2+40x)+160x(x-10)<72000
    16.425-0.175n-0.2n(n-1)≤(n-1)0.4+0.175
    29.12-0.135n-0.4n(n-1)/2≤0.4(n-1)+0.135
    x*(tan(acos(0.018865*x))-0.363970234)>3.47941928
    65 * 65 * g * g + 4 * 130 * 130 + 280 * 65 * g > 4 * g * 13320
    65 * 65 * g * g + 4 * 130 * 130 + 280 * 65 * g > 4 * g * 133.2
    13 * (13 * g ^ 2 + 56 * g + 208) / (16 * g) > 133.2
    x+0<1
    x*(tan(acos(0.018865*x))-0.363970234)>0.9661452
    （200 + (65 * g - 260) / 2)(0.65 - 0.01 * (65 * g - 260) / (2 * g)) - 0.6 * (65 * g - 260) / (2 * g) > 133.2
    （3x+1）（x-3）（x+1）≤0
    （3x+1）（x-3）（x+3)≤0
    2^x-1>86400000
    x < 0.533*(2x+9)
    5a-1>3(a+1) 0.5a-1<7-1.5a
    0<4x+20-8(x-1)<8
    4x+20-8(x-1)>0
    x-3(x-2)>=4 (2x-1)/5>(x+1)/2
    2x+5<=3(x+2) 3x-1>=2x
    103z+56（20-z）<=1550

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