3x>5
    -5000+x-0.25x≥10000
    -500+x-0.25x≥10000
    (x-50)(-20x+2600)≥24000
    x/x-2＞0
    (y-20)*0.8+20>80
    80%x*0.8>80
    0.5a+(3600-50a)/100*1.2<40
    0.5a+(3600-50a)/100*1.2<400000
    3x+13*(4000-x)<28000
    （2000*12-8000）x+（8-x)(4500*3-5000)>100000
    lnx＞lg(-x)
    x＞log(x,1)
    x＞log(x,100000)
    ln(-ex)≥-1000000
    A(2,x)＞5
    cos(A(x,2x-1))＞0
    3-x≥3
    C(x,1)0.2^1*0.8^(x-1)<0.006
    2x^2-x＞1

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