4x^2/(x^2+1)^2-2x/(x^2+1)^2-2/(x^2+1)>0
    -(1/3)>=1/x<=3
    -1/3>=1/x<=3
    48+9L2-L^2<0
    48L+9L^2-L^3<0
    0＜3x+8-5（x-1）＜5
    100x*110%+60(100-x)*125%>=9250
    100x+60(100-x)<=8080
    2x<2
    -(-42.70206*x-4555.74*(1-x)) ≥2.33*(sqrt(88.66814*x^2+40551.12*(1-x)^2))
    -(-0.008540412*x-0.911148*(1-x)) ≥ 2.33*(sqrt(0.01773363*x^2+8.110223*(1-x)^2))
    -(-0.008540412*x-0.911148*(1-x)) ≤2.33*(sqrt(0.01773363*x^2+8.110223*(1-x)^2))
    3×800+80(x－9)＞0.8(3×800+80x)
    15（60－x）＋20x≥1000
    -t^2+30t-105>0
    a^2+4>0
    a^2-12*a+4>0
    1985*x+102060/x<8315
    5x+18000-15x < (25x+(1200-x)45)0.3
    5x^2≤22x-4

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