1000m+800(20-m)≤19200 1000m+800(20-m)≥17800
    (2-m)/2≥0
    x^2-12<0
    9x^4-160x^2+768<0
    -12500-（50000+x）×1%+x≥5000
    330.13-2.77a≥50
    330.13-2.77a≥54
    330.13-2.77a≥57
    330.13-2.77a≥60
    330.13-2.77a≥80
    330.13-2.77a≥100
    x+0.01x>=61
    -50-（100+X）*1%+X>10
    4/x≥-1
    10-m>1/2m
    x^2（1-2lnx）＞1
    x^2（1-2lnx）＜1
    x^2（1-2lnx）＞1
    x^2（1-2lnx）≤1
    1.3x/(x+700)<0.53

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