3(x-1)<2x+4 (x-1)/3>= x/2-1
    2x2+x+1>0
    x-1/5>x+2/2
    -4x+8＜0
    8x-5>=X+16
    tanx>4/7
    tanx>8/7
    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

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