-(a^2)+12-4a<=0
    （5/6）^x＜1/2
    2*x^3-(6*66+1)*x^2+2*66*x > 0
    2*x^3-(6*65+1)*x^2+2*65*x > 0
    2*x^3-(6*67+1)*x^2+2*67*x > 0
    h^3<27*10^-6/54.6/sqrt(3)
    50*(800-20(x-60)) ≤ 24000
    6^x>400*(!(x))
    (6^x)>400*!(x)
    (6^x)/(!(x))>400
    (6^x)/(!(x))>0.99*(e6)
    (6^x)/(!(x))>0.99*(e6)
    (6^x)/(!(x))>0.99*e^6
    (6^x)/(!(x))>0.99*e6
    (6^x)/(e6*!(x))>0.99
    6^x/(e6*!(x))>0.99
    6x>1
    4-3/7>6+2/4
    2x-3/7>3x+2/4
    1.94＜50*tan(x)-19.6/cos(x)^2＜2.44

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