lg((tanx:sqrt(x+x^0))+1)/x＜0
    tanx＜acosx
    (1+1:x)^x＞2.72
    (1+1:x)^x＞e
    1＜x＜ex＜70＜x^x
    -7m^2+20m+4≥0
    300/x>x+5
    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

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