5*（-5x+500）≥750
    5-9.96194×tan(x)+0.87155＜0.1
    5-9.848×tan(x)+10874＜0.1
    tan(x)>0.6878554021
    2x-1/x＞1
     ( ( 0.86 * V ^ 2 + 251.83 + 84.84 ) * 442.5 + 2123.29 * 9442.2 * 9442.2 * V ^ 2 / ( 599.6 * V - 1568.1 ) ^ 2 ) / 10000 ≤101.77
     ( ( 0.86 * V ^ 2 + 251.83 + 84.84 ) * 442.5 + 2123.29 * 9442.2 * 9442.2 * V ^ 2 / ( 599.6 * V - 1568.1 ) ^ 2 ) / 10000 ≤101.1
     ( ( 0.86 * V ^ 2 + 251.83 + 84.84 ) * 442.5 + 2123.29 * 9442.2 * 9442.2 * V ^ 2 / ( 599.6 * V - 1568.1 ) ^ 2 ) / 10000 ≤100.44
    ( ( 0.86 * V ^ 2 + 251.83 + 84.84 ) * 442.5 + 2123.29 * 9442.2 * 9442.2 * V ^ 2 / ( 599.6 * V - 1568.1 ) ^ 2 ) / 10000 ≤99.77
    ((0.86*V^2+251.83+84.84)*442.5+2123.29*9442.2*9442.2*V^2/(599.6*V-1568.1)^2)/10000≤99.37
    14*x^3-32584.5*x-271561033<0
    14*x^3-32584.5*x-271561033>0
    7*(8100*2*2+3700*3*x)>=4792*7*x+4792*6*(11-x)
    7*(8100*2*2+3700*3*x+8100*2)>=4792*7*(x+2)+4792*6*(12-x)
    7*(8100*2*2+3700*3*x+8100*2+8100)>=4792*7*(x+2)+4792*6*(13-x)
    7*(8100*2*2+3700*3*x+8100*2*2)>=4792*7*(x+2)+4792*6*(13-x)
    7*(8100*2*2+3700*3*x+8100*2)>=4792*7*(x+2)+4792*6*(13-x)
    7*(8100*2*2+3700*3*x+8100*2)>=4792*7*(x+4)+4792*6*(11-x)
    7*(8100*2*2+3700*3*x+8100*2)>=4792*7*(x+2)+4792*6*(11-x)
    7*(8100*2*2+3700*3*x)>=4792*7*(x+2)+4792*6*(11-x)

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