abs(55.242*x-2*61.38*x)/(0.5*55.242*x+61.38*x)<0.1
    x^2-4x-41
    54.5<0.8*0.8x<163.5
    10.9<0.78*0.8y<32.7
    3x≥x+9>3+2x≤xx-x-7
    log（3，9）
    cot90
    (3a+59)-5(a-1)<5 (3a+59)-5(a-1)>0
    （100+x）/240-x/280<0.6
    （100+x）/240-x/280> 0.6
    (x^2+4x-3)(x^2-x-2)≥0
    (x-3)(x-1)≤0
    2x^2-x<3
    18(X-8)-15X=120
    63a+55（32-a）-[55a+50(32-a)]>170
    t≥8-t^2/4
    (48713892586.72-x)/(56079894304.35-x)<0.75
    （x+5）/（x-1）^2≥2
    (4x+2)/(3x-1)>0
    (x-1)/x≥2

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