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
    3x-1>2(2-5x)
    (x-5)/3+1<=(3/2)*x
    2-5x<8-6x
    x/（27.1+x）<=0.299
    （5.4－3.6）x＋（14－8）×[（1520－3.6x）／8]≧1050
    1/2 * ( 20 * x + 10 * x ) > ( 100 - 2.5 * x ) + x * 10*0.5
    -3a+2<-2a+2

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