54－6x≥8x+12
    (0.2x-1.2)/0.3-(0.12-0.1x)/0.05<=-4
    x×【80000-2000(x-25)】≥2000000
    （x-1）/0.5+(2x+1)/0.25>=8
    (25＋x)×【80000-2000×(x-25)】≥2000000
    （25＋x）×（130000-2000x）≥2000000
    3-(x-2)/2<=x/6
    (2x+1)/3<=(3x-3)/4+1
    x+3>2x
    5x-6>2x
    3x-5>2x-1
    ((40*n+193.44)*((n-4.86)^2))/6+575.26*n+283.9036-1.2*(258.32*n+449.3746+(((n^2)*(13.33*n+245.58069))/6))≥0
    ((40*n+193.44)*((n-4.86)^2))/6+575.26*n+283.9036-1.2*(258.32*n+449.43+((n^2)*(13.33*n+245.58069))/6)≥0
    2/5 a≤100-a 120(100-a)+80a≤9710
    m^3-3m-4≤0
    (30十40(10一x)0.6≤200
    3X∧2＋1＞0
    x*x<0
    x-1<2x+1
    3x-1>2x+3

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