x+100/x>50
    (13/50)x+(26/(13/50)-x)(13/50+0.5)≤39
    x+1/x-1<4
    （1-x）（x+2）≥0
    x^2-4x-5＞0
    （2.2－2）（6000－x）＋（3.3-2.8）x≥1800
    （2.2－2）（6000－y）＋（3.3-2.8）y≥1800
    （2.2－2）（6000－y）＋（3.3-2.8）≥1800
    x＾-x-6<0
    (5/4)^x>=3
    ln(3)/ln(5/4)>=x
    (5/4)^x >= 3
    (3x-5)/(x+1)<1
    (2x-3)/(2-3x)<0
    (x-1)/(x-3)>4
    6.25x＞(0.8763x-2*1.141-1%*0.8763x)*7.2288
    (3x-4)(2x+1)>0
    (2x-1)/3>1-(4x+3)/2
    e^x≥ln(x＋e)
    e^x≥ln(x＋3)

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