-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
    x^4-1.36*x^2+0.0396>0
    x^4-1.36*x^2-0.0404<0
    12x^2-72x>0
    4x^3-36x^2＜0
    0
    0
    1-（0.6）^n>=0.9
    3x+3<0
    [(400*0.9)-300]*x+(324-300)*(100-x)<3210
    1ex^1.01>1ex*1e8
    1/(1-x)^(1/3)>1/3
    （1+X）e^（-X）<=0.01
    （1+X）e^（-X)>=0.01

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