1+2x>3（x-1）
    1+2x>x-1
    2(2x-1)≤3x-4
    x^2-x-3≤0
    -3(x-2)≥4-x
    3x-(x+2)<2
    3（x-1)≤x+1
    -x+2>2x+2
    -3x-1大于8
    -3x-1大于3
    5-3(x-2)≥x-1
    x/(0.895*102446)+400*x/(1.05*1430000*(1-0.8*x/14980))<310
    N/(0.895*102446)+400*N/(1.05*1430000*(1-0.8*N/14980))<310
    1000x-(1000×5+1000x)×0.5%≥1000×5+1000
    (x+2)e^x≥1
    (x-100)/100+24% = (x-85)/85
    (x-100)/100+24%=(x-85)/85
    x-4>0 x-6<0 2x≥x+3
    （x+2）/5-（x-1）/4≥0
    （x+2）/5-（x-1）/4

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