(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
    （2a+2）^2-4a^2+4＜0
    x（6x+5）＜4
    19200+0.12x(x+50)≤140(x+50)
    2/x+2>3
    （2-x）*(2x-1)＞0
    （x^2+8x+16）*(x-3)*(x-1)≤0
    27-x<14
    (2-x)(x+3)<0
    a^2-3a-4＞a+2
    x^2+4x+3<=0
    x^2-2x-3>0
    35-6x>0 20-4x>0
    6x^2+x<40

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