x^2+4*x<0
    x^5+x^2>2
    -3*x^3+5>-7
    -3*(x+2)^2+5>7
    x-abs(x-abs(x))>2
    -3<(3*x-2)/(x-1)<3
    6*x^2-11*x+5>0
    3/x+1≥5
    4*x^3-x^2+20*x>0
    6-3x+10/x+2＞0
    2m^2-2<0
    a^2+a<0
    7+k ≤2^k
    -3a^2-4a+4>0
    7+k≤2^k
    a^2-2a+2>0
    ｛1/1.22^2×[6×4.5×10^4×250/（2×0.7×h×240^2 ）]^2+[4.5×10^4/(2×0.7×h×240) ]^2}^0.5≤160
    ｛1/1.22^2 [6×4.5×10^4×250/（2×0.7×h×240^2 ）]^2+[4.5×10^4/(2×0.7×h×240) ]^2}^0.5≤160
     16 > 5.2a + 3
    2x-5≤-2x+3

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