(1000x1.03^x)1.03＜2x1.05^(x-1)
    lg x＜1
    2x∧2－7x+3＜0
    x/173^2≤23.9
    10x^2+100x+10000<2^32
    n(n-3)<40
    2018<-2019/a<2019
    0<-1/a<1
    3x*x+2x ＞0
    9*(x^2)+6*x+1≤0
    9x^2+6x+1≤0
    -2a+1<0
    4-2*（m+1）+m-2<0
    m(1-（m^2-2m+9）^1/2)<9
    (0.9*160)a+(0.85*110)(20-a)≤2100
    5000+70%*（95%*100*x+5%*120*x）≥18000
    5000+70%*（95%*100*x+5%*120*x）≥16000
    5000+70%*（95%*100*x+5%*120*x）≥12000
    3000+70%*（95%*100*x+5%*120*x）≥12000
    x-4/x-5<=0

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