x+8大于3
    -12324.5*x^2+576.975*x+54.0225>0
    -a^3+4a-1＞0
    b/2≧1
    1-a≧0
    -a≧-1
    n＾3＋6n＾2+n≤0
    n＾3＋6n＾2+5n≤6
    75-（X+0.18）≥0.135
    75-（X+0.18）≥0.1+0.035*1
    -2x≥3
    4x>x-7/2
    270≤1800-26(50-x)-35x≤300
    (2x+6)/5<[(x+1)/2]+1
    x(x-2)<0
    x(x-3)<0
    1.8x+74>0.45x+66
    1.8x+74<0.45x+66
    1.8x+74>0.45x+66
    √(2x-3)+√(3x-5)>√(5x-6)

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