x - 3 ＞x
    x-3＜x
    sin（x/3）＞cosx
    x+2<3(x-1) 2x>5(3-2x) (x+3)/4+2≥(x-4)/3
    x^2+x+5≤5x+1
    -x^2-4≥4x
    -x^2+4≥4x
    （200+2）* x +(200+200)*(1-x) <=218
    （200+2）* x +(200+200)*(1-x) <=218
    3x+4>x
    2（x-1）>=x-3
    3-x>1
    8400/(103+x)+10000/(123.6+x)<150
    6000/x + 10000/(x+22.4) + 10000/x < 150
    4400/x + 10000/(x+22.4) + 10000/x ＜ 150
    3800/(112+x)+10000/(134.4+x)+10000/(112+x)<150
    7800/(112+x)+10000/(134.4+x)+10000/(112+x)<150
    7800/(103+x)+10000/(123.6+x)＜150
    abs(x^2-3*x+2)>abs(x-1)
    (x-1)*e^x<0

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