（2/x-3）＋1>3/2
    r*(1+r^0.5)^2/(r-1)^2≥0.99
    0.01*r^2-3.02*r-2*r^(3/2)+1.01≥0
    2.5x≤4x-3<2.5x-3+1
    2a>a+6666
    2a>a+5
    2a-a>3
    2a-a-3>0
    2a+a>3
    2a+a-3>0
    2a+a+3>0
    2a-a+3>0
    4a-a-8>0
    4a-a>8
    4a-a+8<0
    4a-a+8>0
    4a>a+8
    2a>a+3
    118a+76(20-a)≤1910
    3x+4[x]=16

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