14.01+x－x*0.005≥20
    -0.3<(x-4.6)/4.6<0.3
    -0.3<(x-28)/28<0.3
    -0.3<(x-38.6)/38.6<0.3
    -0.3<(x-49.8)/49.8<0.3
    -0.2<(x-77.8)/77.8<0.2
    -0.2<(x-43.2)/43.2<0.2
    -0.3<(x-43.2)/43.2<0.3
    -0.3<(x-77.8)/77.8<0.3
    26700+x*(1-10%/4)≥50000
    -10x-ln x<=ln 0.02
    8x+(200-x)*10≥339
    2x＞66
    (x+2)/2＞(x+3)/3
    (1/2)(x+4)＜2
    (2x-1)^2-4(x^2-1)>0
    4x^2>0
    (x+2)/5＞(x-1)/4
    x+2/5＞x-1/4
    2-5x/6＜2x-3/2

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