Mathematics
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    10000/x+20000/(x+60)+17500/x+10000/(x+60)≤250
    10000/x+20000/(x+60)+17500/x+10000/x≤250
    10000/x+20000/(x+60)+17500/x+10000x≤250
    10000/x+20000/(x+60)+17500/x≤250
    [10000/x+20000/(x+60)]+17500/x+10000/x≤250
    [10000/x+20000/(x+60)]+17500/x+10000/x≤250
    [10000/x+20000/(x+60)]+17500/x≤250
    250-[10000/x+20000/(x+60)]≥17500/x
    250-[10000/x+20000/(x+60)]≥17500/x+10000/(x+60)
    250-[10000/x+20000/(x+60)]≥17500/x+10000/(x+60)＞0
    250-[10000/x+20000/(x+60)]≥17500/x+20000/(x+60)＞0
    0＜10000/x+20000/(x+60)≤10000/7， 250-[10000/x+20000/(x+60)]≥17500/x+20000/(x+60)＞0
    10000/x+20000/(x+60)≤10000/7， 250-[10000/x+20000/(x+60)]≥17500/x+20000/(x+60)
    10000/x+30000/(x+60)≤10000/70
    10000/x+20000/(x+60)≤10000/70
    10000/x+10000/(x+60)≤10000/70
    x^3-4x+3<0
    x+12/(3x-4)>3
    sqrt（x+1）＜2x-1
    1.288231 < x < 2.458733

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