1000＜83+1/3+x/3+1/3+20-x/2＜25
    10＜83+1/3+x/3+1/3+20-x/2＜25
    3x2+16x-12>0
    x-7<3
    x^2+x-4<0
    sinx
    (15+x）(30-2x)>=400
    x^4－2x＋1＜0
    x4－2x＋1＜0
    X-50-（100+X）×1%≥10
    -50-（100+x）*0.01+x≥50
    5x^7+e^2x<=0
    x+3≥5
    35*b*b+(96+16*sqrt(3))*b-120<0
     -9.172x^2 + 56.66x - 1.8206>85
    -0.0193x^2 + 1.0988x + 71.992>85
    -0.02x^2 + 1.1306x + 70.527>85
    -9.172x^2 + 56.66x - 1.8206>85
    -9.172x^2 + 56.66x - 1.8206<85
    （2/x）+2＞0

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