(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
    x-1/x≥2
    -2x^(2)+3x+5<0
    -2x+3x+5<0
    x^2-3x+2≥0
    x^2≤9
    2+2X+（-2）×4=0
    (X-2/2016)+(X/2017）+（X+2/2018）=6

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