(20+5x)*(30-x)≥1400
    (20+5x)*(30-x)≥1400
    (20+5x)*(30-x)≥1400
    (20+5x)*(30-x)≥1400
    (20+5x)(30-x)≥1400
    5x-1>3(x-1) (x/2)-1<=7-(3x/2)
    8(x-1)>5x-17 x-6>=(x-10)/2
    5x-2>3(x-1)
    x≤2
    12100－a*12%*2/12－a>6000
    21700＜=60x-16000＜=22300
    2-4m>0 7m<0
    200*（500-a）+300a≤130120
    100000-100a≤130120
    1-x<2
    3<-5/3*n+39/50<5
    3<-5/3*n=39/50<5
    600x>=(3000+8000)*(1+20%)
    1.1×2391.58×10^6≤13.8×1050x(1050-x/2)
    ex+lnx<0

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