0.005v^2+0.05v<10
    （x-1）/(1-2x)>=1
    2x+1>7/x<2
    2x+1>7 x<2
    2x+1>7 x<2
    2x+1>7 x<2
    4k（4k-5）<0
    2+7*x<0
    1-(X+1)/2<2-(X+2)/3
    360/11*(2n-1)<720
    (3^1/2)*cos(x)*sin(x) -sin(x)*sin(x)≦1
    -3x^2-2x+21＜0
    -3≤-m-1≤1
    -3≤-m-3≤1
    x^2≤-1
    5x-7≥x^2
    6x-x^2≥9
    6x-x^2≥9
    abs(x+1)＞abs(3-2x)
    abs(x+1)＞abs(3-2x)

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